Problem Resolved - MY BAD
Thank you Jason and Ray for the fast follow-up.
The problem was that I MUST NOT HAVE FOLLOWED the clear directions on installation sequence with CSS Form Builder Build 23 and HTML Editor 3 - Form Builder First, HTML Editor 3 second.
Upon reinstallation of the extensions in the proper sequence, no errors were received.
I thank you all again for your help and apologize for my error here.