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Nobody can tell you anything without proper system info or other technical details.
The only solution so far reported is to uninstall After Effects, and then re-install it.
You might need to run the free Adobe cleanup tool
I uninstalled all Adobe product and Creative Cloud.
Than I used Creative Cloud Cleaner Tool and cleared it all.
I restarted the computer and installed all Adobe products again.
Character Animator is working now.
This is a little time consuming solution but it works.
Thank you for your advices.