dotnet new error in SDK 2.0.3

I have a working template which is used in production environment and is regularly updated. It works fine with .NET Core SDK version 2.0.0 and version 2.0.2.

I installed SDK 2.0.3 as I wanted to test my existing template. Installation of the template went fine as seen on this image When I tried dotnet new -h I got the following message

Value cannot be null.                                                                                                                                                                                                                          
Parameter name: key                                                                                                                                                                                                                            
   at System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)                                                                                                                                                                
   at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)                                                                                                                                                                              
   at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& value)                                                                                                                                                             
   at Microsoft.TemplateEngine.Orchestrator.RunnableProjects.SimpleConfigModel.Evaluate(IParameterSet parameters, IVariableCollection rootVariableCollection, IFileSystemInfo configFile)                                                      
   at Microsoft.TemplateEngine.Orchestrator.RunnableProjects.RunnableProjectGenerator.GetCreationEffects(IEngineEnvironmentSettings environmentSettings, ITemplate templateData, IParameterSet parameters, IComponentManager componentManager, 
String targetDirectory)                                                                                                                                                                                                                        
   at Microsoft.TemplateEngine.Cli.New3Command.CheckIfTemplateHasScriptRunningPostActions(ITemplate template)                                                                                                                                  
   at Microsoft.TemplateEngine.Cli.New3Command.GetTemplateUsageInformation(ITemplateInfo templateInfo, IParameterSet& allParams, IReadOnlyList`1& userParamsWithInvalidValues, IReadOnlyDictionary`2& variantsForCanonicals, HashSet`1& userPar
amsWithDefaultValues, Boolean& hasPostActionScriptRunner)                                                                                                                                                                                      
   at Microsoft.TemplateEngine.Cli.New3Command.ShowTemplateGroupHelp(IList`1 templateGroup, Boolean showImplicitlyHiddenParams)                                                                                                                
   at Microsoft.TemplateEngine.Cli.New3Command.DisplayTemplateHelpForSingularGroup()                                                                                                                                                           
   at Microsoft.TemplateEngine.Cli.New3Command.<EnterSingularTemplateManipulationFlowAsync>d__57.MoveNext()                                                                                                                                    
--- End of stack trace from previous location where exception was thrown ---                                                                                                                                                                   
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()                                                                                                                                                                           
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)                                                                                                                                           
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()                                                                                                                                              
   at Microsoft.TemplateEngine.Cli.New3Command.<EnterTemplateManipulationFlowAsync>d__58.MoveNext()                                                                                                                                            
--- End of stack trace from previous location where exception was thrown ---                                                                                                                                                                   
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()                                                                                                                                                                           
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)                                                                                                                                           
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()                                                                                                                                              
   at Microsoft.TemplateEngine.Cli.New3Command.<ExecuteAsync>d__59.MoveNext()                                                                                                                                                                  
--- End of stack trace from previous location where exception was thrown ---                                                                                                                                                                   
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()                                                                                                                                                                           
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)                                                                                                                                           
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()                                                                                                                                              
   at Microsoft.TemplateEngine.Cli.CommandParsing.NewCommandInputCli.<>c__DisplayClass19_0.<<OnExecute>b__0>d.MoveNext()                                                                                                                       

When I tried to create new template with command dotnet new bibapi -n test123 I got following error:

Template "BIB Rest API" could not be created.
Value cannot be null.
Parameter name: key

The same template is working fine when I change SDK to 2.0.0 or 2.0.2 using global.json in folder where I’m creating templates.

[seancpeters]

@neman - thanks for bringing this to our attention. The failure of your template in 2.0.3 is a regression. It’s ok to explicitly define a “name” symbol in a template, it’s just a special case. I’ve made PR #1351 to fix this in the 2.1.0-preview1 branch of this repo.

[neman]

@SummerSun I guess that we have to wait for .NET Core 2.1.0 release. You can check here https://github.com/dotnet/templating/releases the last version release date.