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SF Beginner 2019SF Beginner 2019 

AutoAssign Permissionset via VisualFlow

I am Encountering this error

Unable to Access Page
The value of a parameter contains a character that is not allowed or the value exceeds the maximum allowed length. Remove the character from the parameter value or reduce the value length and resubmit. If the error still persists, report it to our Customer Support team. Provide the URL of the page you were requesting as well as any other related information. 

wherein I just followed this one

https://automationchampion.com/tag/auto-remove-permission-sets-in-salesforce/

so I created a process builder wherein upon edit or create, it will assigne a permission set. the create works perfectly, but when I tried to do blank update/update of a field, it returns tha above error