db.exception.InvalidDatabase: Invalid XML file constraintsA.xml :
org.xml.sax.SAXParseException; systemId: file:/home/mvainbau/YearProject/Exam-Scheduler/db/2017_winter_test/constraintsA.xml; lineNumber: 5; columnNumber: 15; cvc-complex-type.2.4.a: Invalid content was found starting with element 'date'. One of '{start_date}' is expected
db.exception.InvalidDatabase: Invalid XML file constraintsA.xml : org.xml.sax.SAXParseException; systemId: file:/home/mvainbau/YearProject/Exam-Scheduler/db/2017_winter_test/constraintsA.xml; lineNumber: 5; columnNumber: 15; cvc-complex-type.2.4.a: Invalid content was found starting with element 'date'. One of '{start_date}' is expected