Object reference Studio Error

Can any one help me with Error (Publishing the project has failed Error: Object reference not set to an instance of an object) that I am getting while publishing the main workflow.

This happens when there is trouble between variables and arguments etc… often because the variable/argument has not a given value in the workflow you are trying to execute

If I am trying to publish the same workflow from another robot server it is not giving any error , it is getting published properly.
I am getting this error only in one of the robot servers that we are using.

@Ramya1994 Try once delete your json file in your project folder and run it

Did you found any solution?