The version is Acrobat 10. It starts with one document, and then goes on to all the other documents that I try to add the JS to. Let me explain in details.
I guess this would help you. Let me know if you need more info. I cannot provide you a document as the document I was getting a error on is resolved after I Switched ON my PC today morning.
I saw this error too today in Acrobat XI (11.0.3) followed by some weird exceptions in the JS console.
If this message came up from time to time and I clicked "No" all scripts in my forms and even installed folder level scripts were terminated by Acrobat.
All forms with scripts I opened caused this error message...
... followed by the exeption Operation failed Root.(null): ... script terminated.
I made some debugging on my forms, but didn't find a logical answer.
Finally I discovered that I also were not able to do a simple Drag'n Drop on my OS (Win7), so the the symptoms in Acrobat probably seemed to be only a side effect of a OS problem.
Indeed! After a reboot of my system everything was fine in Acrobat.