Guided Procedures Issue with Old Requests

Hi Experts,

We have made changes to the existing GP Input/Output parameter structure and the new requests are working fine.

When we open the old requests(Completed) which does not have new parameter structure is not opening since the structure is changed.

It throws GP Invocation Exception and structure with name and namespace null.

Any of you experienced the same issue? How can we fix this?

Appreciate your quick help.

Thanks in advance.

Regards,

Senthil