Hi @Gopinath Arun ,
Welcome to Microsoft Q&A forum and thanks for using Azure services.
As I understand from the question, you are facing Internal Server Error:Failed to submit job on job cluster.
Could you please try to build another customized Debug session and see if this helps.
Refer to the video for: creation of Data Flow Debug Session.
Another reason for Internal Server error could be unsupported letters in Resource Group Name.
Please try both and let us know the result.