Subscribers are getting **error 11581-Profile description is invalid**

Subscribers are getting issues with 11581 when signing up

error 11581-Profile description is invalid

I have looked everywhere but there are few threads about this issue.

here was when the issues was discovered and fix in 2012 - https://www.s2member.com/forums/topic/error-generic-processor-error-11581/page/2/#post-33477

any help would be great