I am unable to create new
workflows or edit existing workflows in SharePoint designer 2013. Below is the error is get:
If I try to open again I get below error:
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You can try to delete the cache of the SP Designer.
Delete the content inside of the following folders:
%APPDATA%\Microsoft\Web Server Extensions\Cache
Also some ideas:
Try to access the workflow from SharePoint Designer installed on another computer.
Check the update status of your farm in general