Error on saving the solution

[rohithakosuru]

System.NotImplementedException: The method or operation is not implemented. at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.VisitUncheckedStatement(UncheckedStatement uncheckedStatement, Object data) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.ConvertNodes[T](IEnumerable1 nodes, AstNodeCollection1 result, Func2 transform) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.VisitBlockStatement(BlockStatement blockStatement, Object data) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.VisitForStatement(ForStatement forStatement, Object data) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.ConvertNodes[T](IEnumerable1 nodes, AstNodeCollection1 result, Func2 transform) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.VisitBlockStatement(BlockStatement blockStatement, Object data) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.VisitCheckedStatement(CheckedStatement checkedStatement, Object data) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.ConvertNodes[T](IEnumerable1 nodes, AstNodeCollection1 result, Func2 transform) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.VisitBlockStatement(BlockStatement blockStatement, Object data) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.VisitMethodDeclaration(MethodDeclaration methodDeclaration, Object data) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.ConvertMembers[T,S,M](AstNode parent, T result, Role1 sourceRole, Role1 targetRole) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.VisitTypeDeclaration(TypeDeclaration typeDeclaration, Object data) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.ConvertMembers[T,S,M](AstNode parent, T result, Role1 sourceRole, Role1 targetRole) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.VisitNamespaceDeclaration(NamespaceDeclaration namespaceDeclaration, Object data) at ICSharpCode.NRefactory.VB.Visitors.CSharpToVBConverterVisitor.VisitSyntaxTree(SyntaxTree syntaxTree, Object data) at ICSharpCode.ILSpy.VB.VBLanguage.RunTransformsAndGenerateCode(AstBuilder astBuilder, ITextOutput output, DecompilationOptions options, ModuleDefinition module) at ICSharpCode.ILSpy.VB.VBLanguage.<>c__DisplayClass15_0.<WriteCodeFilesInProject>b__2(IGrouping2 file) at System.Threading.Tasks.Parallel.<>cDisplayClass17_0`1.b1() at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask) at System.Threading.Tasks.Task.<>cDisplayClass176_0.b0(Object )

[lextm]

You really should read the Readme file once again, as it said "If you need a C# parser / compiler frontend, use Microsoft.CodeAnalysis (Roslyn) instead."

[siegfriedpammer]

@lextm looking at the bottom of the stack trace this is an error produced by an old version of ILSpy, which still had VB support. So actually, it should be reported at https://github.com/icsharpcode/ILSpy/issues but we cannot do anything about the error anyway because ILSpy 2.x is long out of support and all ILSpy versions > 2 do not have VB support anymore. It is unsupported.