It sounds very very similar to this post. What action were you taking to trigger this?
https://community.ptc.com/t5/Windchill/Exception-while-creating-Project/m-p/947784
Hello @HL_8857949,
It looks like you have a response from a community champion. If it helped you solve your question please mark the reply as the Accepted Solution.
Of course, if you have more to share on your issue, please let the Community know so other community members can continue to help you.
Thanks,
Vivek N.
Community Moderation Team.