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londonappbrewery / quizzler-flutter

Learn to Code While Building Apps - The Complete Flutter Development Bootcamp
https://www.appbrewery.co
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can not run the app #31

Closed calystary closed 2 years ago

calystary commented 2 years ago

when trying to run: ======== Exception caught by widgets library ======================================================= The following assertion was thrown building QuizPage(dirty, state: _QuizPageState#0c640): A non-null String must be provided to a Text widget. 'package:flutter/src/widgets/text.dart': Failed assertion: line 378 pos 10: 'data != null'

The relevant error-causing widget was: QuizPage QuizPage:file:///C:/Users/lulu/Desktop/projects/angela/quizzler_flutter/lib/main.dart:16:20 When the exception was thrown, this was the stack:

2 new Text (package:flutter/src/widgets/text.dart:378:10)

3 _QuizPageState.build (package:quizzler/main.dart:45:22)

4 StatefulElement.build (package:flutter/src/widgets/framework.dart:4870:27)

5 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4754:15)

6 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

7 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

8 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

9 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

10 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

11 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

12 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

13 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

14 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)

15 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

16 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

17 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

18 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

19 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

20 StatelessElement.update (package:flutter/src/widgets/framework.dart:4834:5)

21 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

22 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

23 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

24 StatelessElement.update (package:flutter/src/widgets/framework.dart:4834:5)

25 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

26 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

27 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

28 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)

29 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

30 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

31 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

32 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)

33 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

34 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:5787:32)

35 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6445:17)

36 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

37 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

38 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

39 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

40 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

41 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

42 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

43 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

44 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)

45 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

46 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

47 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

48 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

49 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

50 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

51 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

52 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

53 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

54 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

55 StatelessElement.update (package:flutter/src/widgets/framework.dart:4834:5)

56 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

57 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

58 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

59 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

60 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

61 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

62 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

63 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

64 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

65 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

66 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

67 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

68 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

69 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

70 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

71 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)

72 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

73 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

74 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

75 StatelessElement.update (package:flutter/src/widgets/framework.dart:4834:5)

76 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

77 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

78 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

79 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

80 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

81 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

82 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

83 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

84 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)

85 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

86 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

87 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

88 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

89 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

90 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

91 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

92 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

93 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

94 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

95 StatelessElement.update (package:flutter/src/widgets/framework.dart:4834:5)

96 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

97 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

98 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

99 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

100 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

101 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

102 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

103 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

104 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

105 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

106 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

107 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

108 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

109 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

110 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

111 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

112 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

113 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

114 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

115 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

116 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

117 StatelessElement.update (package:flutter/src/widgets/framework.dart:4834:5)

118 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

119 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

120 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

121 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

122 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

123 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

124 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

125 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

126 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

127 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

128 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

129 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

130 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)

131 _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:111:11)

132 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

133 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

134 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

135 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

136 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

137 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

138 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

139 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

140 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

141 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

142 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)

143 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

144 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

145 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

146 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)

147 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

148 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

149 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

150 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

151 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

152 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

153 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

154 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

155 StatelessElement.update (package:flutter/src/widgets/framework.dart:4834:5)

156 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

157 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

158 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

159 StatelessElement.update (package:flutter/src/widgets/framework.dart:4834:5)

160 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

161 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)

162 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

163 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

164 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

165 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)

166 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

167 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

168 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

169 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)

170 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

171 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

172 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

173 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

174 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

175 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

176 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

177 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

178 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

179 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)

180 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)

181 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)

182 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)

183 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

184 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2659:19)

185 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:882:21)

186 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)

187 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)

188 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1081:9)

189 SchedulerBinding.scheduleWarmUpFrame. (package:flutter/src/scheduler/binding.dart:862:7)

(elided 6 frames from class _AssertionError, class _RawReceivePortImpl, class _Timer, and dart:async-patch)

calystary commented 2 years ago

didn't change nothing in the code, only wiped data in emulator, after that started working,