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  1. Expression evaluation failed: Object reference not set to an instance of an object
  2. NullReferenceExceptionObject reference not set to an instance of an object
  3. at Microsoft.FSharp.Core.Operators.FailurePattern (System.Exception error) [0x00001] in <5939249c904cf4daa74503839c243959>:0
  4. at Microsoft.FSharp.Compiler.ErrorLogger+ErrorLoggerExtensions.ReraiseIfWatsonable (System.Exception exn) [0x0002d] in <590496d0ddab8ea7a7450383d0960459>:0
  5. at Microsoft.FSharp.Compiler.ErrorLogger+ErrorLoggerExtensions.ErrorLogger.ErrorRecovery (Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger x, System.Exception exn, Microsoft.FSharp.Compiler.Range+range m) [0x000d2] in <590496d0ddab8ea7a7450383d0960459>:0
  6. at Microsoft.FSharp.Compiler.ErrorLogger+ErrorLoggerExtensions.ErrorLogger.StopProcessingRecovery (Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger x, System.Exception exn, Microsoft.FSharp.Compiler.Range+range m) [0x000b5] in <590496d0ddab8ea7a7450383d0960459>:0
  7. at Microsoft.FSharp.Compiler.Interactive.Shell+FsiInteractionProcessor.InteractiveCatch[b] (Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger errorLogger, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] f, b istate) [0x00033] in <590496d0ddab8ea7a7450383d0960459>:0
  8. at Microsoft.FSharp.Compiler.Interactive.Shell+FsiInteractionProcessor.ExecInteraction (Microsoft.FSharp.Compiler.AbstractIL.Internal.Library+CompilationThreadToken ctok, Microsoft.FSharp.Compiler.CompileOps+TcConfig tcConfig, Microsoft.FSharp.Compiler.Interactive.Shell+FsiDynamicCompilerState istate, Microsoft.FSharp.Compiler.Ast+ParsedFsiInteraction action, Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger errorLogger) [0x00010] in <590496d0ddab8ea7a7450383d0960459>:0
  9. at Microsoft.FSharp.Compiler.Interactive.Shell+FsiInteractionProcessor.execParsedInteractions (Microsoft.FSharp.Compiler.AbstractIL.Internal.Library+CompilationThreadToken ctok, Microsoft.FSharp.Compiler.CompileOps+TcConfig tcConfig, Microsoft.FSharp.Compiler.Interactive.Shell+FsiDynamicCompilerState istate, Microsoft.FSharp.Core.FSharpOption`1[T] action, Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger errorLogger, Microsoft.FSharp.Core.FSharpOption`1[T] lastResult) [0x002a4] in <590496d0ddab8ea7a7450383d0960459>:0
  10. at Microsoft.FSharp.Compiler.Interactive.Shell+clo@2089-298.Invoke (Microsoft.FSharp.Compiler.AbstractIL.Internal.Library+CompilationThreadToken ctok, Microsoft.FSharp.Compiler.CompileOps+TcConfig tcConfig, Microsoft.FSharp.Compiler.Interactive.Shell+FsiDynamicCompilerState istate) [0x00003] in <590496d0ddab8ea7a7450383d0960459>:0
  11. at Microsoft.FSharp.Core.FSharpFunc`2[T,TResult].InvokeFast[V,W] (Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] func, T arg1, TResult arg2, V arg3) [0x0000d] in <5939249c904cf4daa74503839c243959>:0
  12. at Microsoft.FSharp.Compiler.Interactive.Shell+FsiInteractionProcessor.mainThreadProcessAction[a,b] (a ctok, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] action, b istate) [0x0004a] in <590496d0ddab8ea7a7450383d0960459>:0
  13. at Microsoft.FSharp.Compiler.ErrorLogger+ErrorLoggerExtensions.ReraiseIfWatsonable (System.Exception exn) [0x00040] in <590496d0ddab8ea7a7450383d0960459>:0
  14. at Microsoft.FSharp.Compiler.ErrorLogger+ErrorLoggerExtensions.ErrorLogger.ErrorRecovery (Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger x, System.Exception exn, Microsoft.FSharp.Compiler.Range+range m) [0x000d2] in <590496d0ddab8ea7a7450383d0960459>:0
  15. at Microsoft.FSharp.Compiler.ErrorLogger+ErrorLoggerExtensions.ErrorLogger.StopProcessingRecovery (Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger x, System.Exception exn, Microsoft.FSharp.Compiler.Range+range m) [0x000b5] in <590496d0ddab8ea7a7450383d0960459>:0
  16. at Microsoft.FSharp.Compiler.Interactive.Shell+FsiInteractionProcessor.mainThreadProcessAction[a,b] (a ctok, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] action, b istate) [0x00104] in <590496d0ddab8ea7a7450383d0960459>:0
  17. at Microsoft.FSharp.Compiler.Interactive.Shell+FsiInteractionProcessor.mainThreadProcessParsedInteractions (Microsoft.FSharp.Compiler.AbstractIL.Internal.Library+CompilationThreadToken ctok, Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger errorLogger, Microsoft.FSharp.Core.FSharpOption`1[T] action, Microsoft.FSharp.Compiler.Interactive.Shell+FsiDynamicCompilerState istate) [0x0000b] in <590496d0ddab8ea7a7450383d0960459>:0
  18. at Microsoft.FSharp.Compiler.Interactive.Shell+EvalInteraction@2232.Invoke (Microsoft.FSharp.Compiler.Interactive.Shell+FsiDynamicCompilerState istate) [0x00013] in <590496d0ddab8ea7a7450383d0960459>:0
  19. at Microsoft.FSharp.Compiler.Interactive.Shell+FsiInteractionProcessor.InteractiveCatch[b] (Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger errorLogger, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] f, b istate) [0x00018] in <590496d0ddab8ea7a7450383d0960459>:0
  20. at Microsoft.FSharp.Compiler.ErrorLogger+ErrorLoggerExtensions.ReraiseIfWatsonable (System.Exception exn) [0x00040] in <590496d0ddab8ea7a7450383d0960459>:0
  21. at Microsoft.FSharp.Compiler.ErrorLogger+ErrorLoggerExtensions.ErrorLogger.ErrorRecovery (Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger x, System.Exception exn, Microsoft.FSharp.Compiler.Range+range m) [0x000d2] in <590496d0ddab8ea7a7450383d0960459>:0
  22. at Microsoft.FSharp.Compiler.ErrorLogger+ErrorLoggerExtensions.ErrorLogger.StopProcessingRecovery (Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger x, System.Exception exn, Microsoft.FSharp.Compiler.Range+range m) [0x000b5] in <590496d0ddab8ea7a7450383d0960459>:0
  23. at Microsoft.FSharp.Compiler.Interactive.Shell+FsiInteractionProcessor.InteractiveCatch[b] (Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger errorLogger, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] f, b istate) [0x00033] in <590496d0ddab8ea7a7450383d0960459>:0
  24. at Microsoft.FSharp.Compiler.Interactive.Shell+FsiInteractionProcessor.EvalInteraction (Microsoft.FSharp.Compiler.AbstractIL.Internal.Library+CompilationThreadToken ctok, System.String sourceText, System.String scriptFileName, Microsoft.FSharp.Compiler.ErrorLogger+ErrorLogger errorLogger) [0x00058] in <590496d0ddab8ea7a7450383d0960459>:0
  25. at Microsoft.FSharp.Compiler.Interactive.Shell+FsiEvaluationSession.EvalInteractionNonThrowing (System.String code) [0x0001c] in <590496d0ddab8ea7a7450383d0960459>:0
  26. at IfSharp.Kernel.IfSharpKernel.executeRequest (IfSharp.Kernel.KernelMessage msg, IfSharp.Kernel.ExecuteRequest content) [0x00096] in <5abdc1ab1b085d3da7450383abc1bd5a>:0
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