Custom package can't import namespace

Help
1

hi, kindly help me to resolve the below issue.

I converted dll to nuget file and instakll into uipath, but i cant import my class library

2

is your package is visible in available packages…??

3

yeah… its installed and also there in C:\Program Files (x86)\UiPath Studio\Packages. but i can’t import

4

no in Ui path when you try ti install is it visible under available in packages is my question not in your package directory.?

5

yeah… it visible

6

can you please provide what error you are getting when you tried to install the same?

7

i installed my custom package. when i try to import my class. i cant find anything

8

after installed my package. i restarted uipath & system also. but i can’t import my class library in Imported Namespaces in UIPath

9

please check out the link this might help you same way i followed and am able to access my library in ui path

10

thanks divya… i found answer… we need to add the below class in our custom class library

public class RegisterMetadata : System.Activities.Presentation.Metadata.IRegisterMetadata
{
public void Register()
{
}
}

1 Like
11

Hi Selvam/Divyashreem,

I created class library in C#, and in that I created one function whose work is send an string as a output. and Class is inherited with IRegisterMetaData.

public class Class1 : IRegisterMetadata
{
public static string GetName(int i)
{
if (i == 1)
{
return “I am one”;
}
else
{
return “I am two”;
}
}

    public void Register()
    {
        
    }
}

Now, I created a package of this dll, and add it in UiPath packages folder and install it from UI.
then I take one assign activity and called the function as
ClassLibrary1.Class1.GetName(1), but when I run this then it gives me an error as mentioned below:

[Window Title]
Workflow Exception

[Main Instruction]
Main has thrown an exception

[Content]
Message: The invoked workflow ‘Main’ has validation errors. Please review the workflow and resolve the errors.

Exception Type: Exception

[Expanded Information]
System.Exception: The invoked workflow ‘Main’ has validation errors. Please review the workflow and resolve the errors. —> System.Activities.InvalidWorkflowException: The following errors were encountered while processing the workflow tree:
‘Main’: The private implementation of activity ‘1: Main’ has the following validation error: Compiler error(s) encountered processing expression “ClassLibrary1.Class1.GetName(1)”.
‘ClassLibrary1’ is not declared. It may be inaccessible due to its protection level.

at System.Activities.Hosting.WorkflowInstance.ValidateWorkflow(WorkflowInstanceExtensionManager extensionManager)
at System.Activities.Hosting.WorkflowInstance.RegisterExtensionManager(WorkflowInstanceExtensionManager extensionManager)
at System.Activities.WorkflowApplication.EnsureInitialized()
at System.Activities.WorkflowApplication.Enqueue(InstanceOperation operation, Boolean push)
at System.Activities.WorkflowApplication.SimpleOperationAsyncResult.Run(TimeSpan timeout)
at System.Activities.WorkflowApplication.BeginRun(AsyncCallback callback, Object state)
at UiPath.Executor.RobotRunner.<>c__DisplayClass49_0.b__0()
— End of inner exception stack trace —

Please help me on this.

Thanks
Harsh