I the classroom hit and miss students getting this error when clicking on workbench with latest ver

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An unexpected error has occurred: The type initializer for 'Ansys.Core.Expressions.ExpressionEvaluator' threw an exception.

System.MissingMethodException: Method not found: 'System.Collections.Generic.IEnumerable`1<!!0> Microsoft.Scripting.Utils.ReflectionUtils.GetCustomAttributes(System.Reflection.Assembly, Boolean)'.

at IronPython.Runtime.Binding.PythonBinder.DomainManager_AssemblyLoaded(Object sender, AssemblyLoadedEventArgs e)

at IronPython.Runtime.Binding.PythonBinder..ctor(PythonContext pythonContext, CodeContext context)

at IronPython.Runtime.PythonContext..ctor(ScriptDomainManager manager, IDictionary`2 options)

--- System.Reflection.TargetInvocationException: Failed to load language 'IronPython 2.7.4': Method not found: 'System.Collections.Generic.IEnumerable`1<!!0> Microsoft.Scripting.Utils.ReflectionUtils.GetCustomAttributes(System.Reflection.Assembly, Boolean)'.

at Microsoft.Scripting.Runtime.LanguageConfiguration.LoadLanguageContext(ScriptDomainManager domainManager, Boolean& alreadyLoaded)

at Microsoft.Scripting.Runtime.DlrConfiguration.LoadLanguageContext(ScriptDomainManager manager, LanguageConfiguration config)

at Microsoft.Scripting.Runtime.DlrConfiguration.TryLoadLanguage(ScriptDomainManager manager, AssemblyQualifiedTypeName providerName, LanguageContext& language)

at Microsoft.Scripting.Runtime.ScriptDomainManager.GetLanguageByTypeName(String providerAssemblyQualifiedTypeName)

at Microsoft.Scripting.Hosting.ScriptRuntime.GetEngineByTypeName(String assemblyQualifiedTypeName)

at Ansys.Core.Expressions.ExpressionEvaluator.CreateScriptEngine()

--- System.TypeInitializationException: The type initializer for 'Ansys.Core.Expressions.ExpressionEvaluator' threw an exception.

at Ansys.Core.Expressions.ExpressionEvaluator..ctor()

at Ansys.Core.Expressions.ExpressionManager..ctor()

at Ansys.ParameterManager.Data.ParameterEvaluator..ctor(ParameterContainer container)

at Ansys.ParameterManager.Data.ParameterContainer..ctor()

at Ansys.ParameterManager.Commands.CreateStaticParameterContainerCommand.Execute(IFullContext context)

at Ansys.Core.Commands.Concurrency.CommandWorkUnit.executeInContext(CommandContext subContext, IExecutionEngineCallback tracer)

at Ansys.Core.Commands.Concurrency.BaseWorkUnit.doExecute(IExecutionEngineCallback executionEngine, CommandContext subContext)

at Ansys.Core.Commands.Concurrency.BaseWorkUnit.Execute(IExecutionEngineCallback executionEngine, Boolean dontCatchExceptions)

--- Ansys.Core.Commands.CommandFailedException: The type initializer for 'Ansys.Core.Expressions.ExpressionEvaluator' threw an exception.

CommandName: Parameters.CreateStaticParameterContainer()

at Ansys.Core.Commands.CommandAsyncResult.RethrowFailureException(Exception e)

at Ansys.Core.Commands.CommandAsyncResult.Wait(Int32 milliSecondsTimeout, Boolean exitContext)

at Ansys.Core.DataModel.ProjectSystem.Project.InvokeProjectInitializationCommands(IProtectedContext commandContext)

at Ansys.Core.DataModel.ProjectSystem.ResetCommand.Execute(IFullContext context)

at Ansys.Core.Commands.Concurrency.CommandWorkUnit.executeInContext(CommandContext subContext, IExecutionEngineCallback tracer)

at Ansys.Core.Commands.Concurrency.BaseWorkUnit.doExecute(IExecutionEngineCallback executionEngine, CommandContext subContext)

at Ansys.Core.Commands.Concurrency.BaseWorkUnit.Execute(IExecutionEngineCallback executionEngine, Boolean dontCatchExceptions)

--- Ansys.Core.Commands.CommandFailedException: The type initializer for 'Ansys.Core.Expressions.ExpressionEvaluator' threw an exception.

CommandName: Reset()

at Ansys.Core.Commands.CommandAsyncResult.RethrowFailureException(Exception e)

at Ansys.Core.Commands.CommandAsyncResult.Wait(Int32 milliSecondsTimeout, Boolean exitContext)

at Ansys.Core.DataModel.ProjectSystem.ResetCommand.InvokeAndWait(IProtectedContext context)

at Ans.Program.Runtime.Initialize(RuntimeSettings settings)

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