Unable to evaluate expressions during debug.

I am unable to evaluate any expression values during debugging. Also adding anything to watch window results in 'The name x does not exist in the current context.'

After I installed 2018, I deleted VS and reinstalled from MS.

Is anyone else having this issue?

VS 2017 Pro 7.5.3 (build 7)
Unity 2018 1.6f1
OSX 10.13.5

Code (CSharp):

1. System.ArgumentException: The field '<>f__ref$1' is not valid for this type.
2.   at Mono.Debugger.Soft.ObjectMirror.GetValues (System.Collections.Generic.IList`1[T] fields) [0x000b0] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugger.Soft/Mono.Debugger.Soft/ObjectMirror.cs:93
3.   at Mono.Debugger.Soft.ObjectMirror.GetValue (Mono.Debugger.Soft.FieldInfoMirror field) [0x00000] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugger.Soft/Mono.Debugger.Soft/ObjectMirror.cs:74
4.   at Mono.Debugging.Soft.FieldValueReference.get_Value () [0x0006e] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugging.Soft/FieldValueReference.cs:129
5.   at Mono.Debugging.Soft.SoftDebuggerAdaptor.GetHoistedLocalVariables (Mono.Debugging.Soft.SoftEvaluationContext cx, Mono.Debugging.Evaluation.ValueReference vthis, System.Collections.Generic.HashSet`1[T] alreadyVisited) [0x0000b] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugging.Soft/SoftDebuggerAdaptor.cs:944
6.   at Mono.Debugging.Soft.SoftDebuggerAdaptor.GetHoistedLocalVariables (Mono.Debugging.Soft.SoftEvaluationContext cx, Mono.Debugging.Evaluation.ValueReference vthis, System.Collections.Generic.HashSet`1[T] alreadyVisited) [0x000d8] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugging.Soft/SoftDebuggerAdaptor.cs:968
7.   at Mono.Debugging.Soft.SoftDebuggerAdaptor+<GetLocalVariables>d__53.MoveNext () [0x000e2] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugging.Soft/SoftDebuggerAdaptor.cs:1097
8.   at Mono.Debugging.Soft.SoftDebuggerAdaptor.FindByName[T] (System.Collections.Generic.IEnumerable`1[T] items, System.Func`2[T,TResult] getName, System.String name, System.Boolean caseSensitive) [0x0003d] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugging.Soft/SoftDebuggerAdaptor.cs:1217
9.   at Mono.Debugging.Soft.SoftDebuggerAdaptor.OnGetLocalVariable (Mono.Debugging.Evaluation.EvaluationContext ctx, System.String name) [0x00100] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugging.Soft/SoftDebuggerAdaptor.cs:1058
10.   at Mono.Debugging.Evaluation.ObjectValueAdaptor.GetLocalVariable (Mono.Debugging.Evaluation.EvaluationContext ctx, System.String name) [0x00000] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugging/Mono.Debugging.Evaluation/ObjectValueAdaptor.cs:713
11.   at Mono.Debugging.Evaluation.NRefactoryExpressionEvaluatorVisitor.VisitIdentifierExpression (ICSharpCode.NRefactory.CSharp.IdentifierExpression identifierExpression) [0x0003d] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugging/Mono.Debugging.Evaluation/NRefactoryExpressionEvaluatorVisitor.cs:744
12.   at ICSharpCode.NRefactory.CSharp.IdentifierExpression.AcceptVisitor[T] (ICSharpCode.NRefactory.CSharp.IAstVisitor`1[S] visitor) [0x00000] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/nrefactory/ICSharpCode.NRefactory.CSharp/Ast/Expressions/IdentifierExpression.cs:79
13.   at Mono.Debugging.Evaluation.NRefactoryExpressionEvaluator.Evaluate (Mono.Debugging.Evaluation.EvaluationContext ctx, System.String expression, System.Object expectedType) [0x00157] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugging/Mono.Debugging.Evaluation/NRefactoryExpressionEvaluator.cs:82
14.   at Mono.Debugging.Evaluation.ExpressionEvaluator.Evaluate (Mono.Debugging.Evaluation.EvaluationContext ctx, System.String exp) [0x00000] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugging/Mono.Debugging.Evaluation/ExpressionEvaluator.cs:43
15.   at Mono.Debugging.Evaluation.ObjectValueAdaptor.GetExpressionValue (Mono.Debugging.Evaluation.EvaluationContext ctx, System.String exp) [0x00000] in /Users/builder/data/lanes/5965/13cecd02/source/monodevelop/main/external/debugger-libs/Mono.Debugging/Mono.Debugging.Evaluation/ObjectValueAdaptor.cs:1411
16.  

 

Yes, it comes and goes with various flavors of Mono and VS... and whenever it happens I just fall back to good old Debug.Log() outputting, as maddening as that can be with high loads of data.

 

That sounds fun.

 

Ok, Updating VS2017 (with a Installation Failed message) fixed the issue.

 

Any update on this? I got the same issue. Most methods just display the error "Failed to find a match for foo()". I can't even call methods in the immediate window, same error. Does someone know how to make this work?

Windows 10
Unity 2018.2.0f2
Visual Studio Community 2017 v15.8.4
Visual Studio Tools for unity 3.8.0.6

 

Any fix for this?