SharePoint Designer encoutered an error generating the task form.

Hi guys,

I’m trying to create a workflow by copying out of the box Approval WF and just change it a little bit to start on field change. But when I’m trying to publish it, this error comes in. I tried to restart Workflow features, IISreset, clear SD cache. Also I tryed just to copy same OOB WF and save + publish, but same error. OOB WFs are working fine. 

Sharepoint server 2013

Sharepoint Designer 2013

Any help will be appreciated!

?width=750