Solved! Go to Solution.
Hello @BuQu
Could you share some more information? What Designer version? Language? Can you share the input/workflow? When do you get this message: when you try to open the workflow, or when you run the workflow?
It's because you have "<20" and ">65" as groups. The "<" and ">" characters are causing problems.
To the inevitable next statement: I agree that those characters should be usable in this tool. Since they are not, the best course of action for now is to communicate your concern with support@alteryx.com and to replace those characters in your workflow.