Updating Project Progress Throws an Error: Illegal UFT-8 Characters

Document ID : KB000071632
Last Modified Date : 12/06/2018
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When trying to change the progress field in Project Properties Summary Page of a specific project, we are unable to sav and we received the error in the UI: “Illegal UFT-8 Character.” What is causing this problem and how do we resolve it?
CA PPM 14.4+ On Premise or SaaS

You must have some free-form text input fields on this page that contain some illegal (unprintable) characters in them.

Check all of the free-form text fields on the page for unprintable characters by selecting all of the text content in these fields, one at a time, and then pasting it into a Word document. You should be able to then see the non-printable (control) characters within the text content represented by a symbol like this: �.
To resolve the issue you can simply delete these non-printable control characters from the text content, and then paste the text back into the field and SAVE.