I've been experiencing this since a couple hours. every time i submit a user input task in one process model it throws this error even though the process model that is giving me this error hasn't been modified since yesterday and everything was working fine.
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If something was working fine yesterday and it is not today, then something changed.
Is the issue with the User Input task in the screen shot you posted? The one configured as a "Quick Task"?
Yes was a quick task but now it started working i don't know what just happened i tried different browsers also tried in my laptop and the same issue but suddenly started working again. thanks for answering chris.