Facing issue while publishing the process from studio

[lakshminarayana_chavala (Narayana)]

Hi Team,

while publishing the process from studio. it is throwing an error as shown below.

System.NullReferenceException: Object reference not set to an instance of an object.
at UiPath.ActivityCompiler.Preprocessing.WorkflowInvokeListBuilder.BuildList(LoggingScope scope, IEnumerable1 workflows, IEnumerable1 sourceFiles, Boolean processWorkflows, Boolean validateWorkflows)
at UiPath.ActivityCompiler.CommandLine.Utils.CompilationPrerequisitesUtils.<>c__DisplayClass1_0.b__3(LoggingScope listBuilderScope)
at UiPath.WorkflowProcessor.Common.Logging.LoggingScope.Execute(Action1 action) at UiPath.ActivityCompiler.Logging.LoggingManager.ExecuteXamlListBuilder(LoggingScope parent, Action1 action)
at UiPath.ActivityCompiler.CommandLine.Utils.CompilationPrerequisitesUtils.<>c__DisplayClass1_1.b__0(LoggingScope compilerScope)
at UiPath.WorkflowProcessor.Common.Logging.LoggingScope.Execute(Action1 action) at UiPath.ActivityCompiler.Logging.LoggingManager.ExecutePreCompile(LoggingScope parent, Action1 action)
at UiPath.ActivityCompiler.CommandLine.Utils.CompilationPrerequisitesUtils.EnsureCompilationPrerequisite(LoggingScope mainScope, CommandLineOptions programArgs)
at UiPath.ActivityCompiler.CommandLine.CommandLineCompiler.ExecuteCompilation(LoggingScope loggingScope, CommandLineOptions programArgs)
at UiPath.ActivityCompiler.CommandLine.CommandLineCompiler.RunCompiler(LoggingScope loggingScope, CommandLineOptions programArgs)
at UiPath.ActivityCompiler.CommandLine.Program.<>c__DisplayClass4_0.b__1(StudioOptions opts)
at CommandLine.ParserResultExtensions.MapResult[T1,T2,TResult](ParserResult1 result, Func2 parsedFunc1, Func2 parsedFunc2, Func2 notParsedFunc)
at UiPath.ActivityCompiler.CommandLine.Program.RunCompiler(TraceListener consoleTracer, LoggingScope scope, ICommandLineCompiler projectCompiler, String args)

Could you pls help to rectify this error.
Thank you

[pravallikapaluri]

Hi @lakshminarayana_chavala

Could you please

1. Check Variables and arguments have been initailized properly or not.
2. Try to check every invoke workflow activity whether mapped your arguments/variables in a proper way
3. Try to use remove unused variables/arguments in the project.
4. Check everything went well by using workflow analyser.
5. Check all the dependencies versions are been compatible with other

Hope it helps!!

[RaoAshish (Ashish Rao)]

Do Validate project before you publish. This will highlight any issues that exists in the project, missing components or arguments.

[yedukondaluaregala (YK)]

@lakshminarayana_chavala

In your code there is variable created and didn’t pass the any values.

and also look below thread

Getting an error while publishing the package Object Reference Not Set To An Instance of Object

May be due to some variable/argument values are missing. Check the below: Variable Panel and Argument panel if any wrong values has been passed. While Invoking the workflows some argument values are missing

Happy automation
YK

[Parvathy (PS Parvathy)]

Hi @lakshminarayana_chavala

Check the below thread

Getting an error while publishing the package Object Reference Not Set To An Instance of Object

See if this would resolve your issue. I’m not sure why it would only fail on one studio machine and not the other though… If this built using an older version of the UiPath REFramework, the issue may be any files that contain %20 in the filename. Under the Documentation folder, there is a REFramework%20documentation.pdf that could be causing the null reference error. This also applies for files that have spaces in the filename (or %20). See the resolution in the thread below:

Regards
PS Parvathy

[lakshminarayana_chavala (Narayana)]

Hi @RaoAshish, I validated the project it is showing no errors

[Monali_Vekariya (Mona)]

Hi @lakshminarayana_chavala

This error usually happens due to a null or broken reference somewhere in the project, such as an invalid Invoke Workflow, uninitialized argument, or a corrupted XAML or dependency. Apart from basic checks, you should also verify your Main.xaml, remove any unused or broken workflows, check the project.json file for corruption, and try reinstalling or updating all packages. Deleting the .local folder and reopening the project often helps refresh dependencies.
If the issue still persists, try recreating the suspected workflow in a new file or shortening the project path, as sometimes hidden corruption or path issues can cause this during publish.