Hahaha Great News,

I finally solved it with your help

So I checked both the descr_items.txt files from my mod and Vanilla BI and I noticed my mod had One Line more, so I manually searched through 75 pages, page by page to find that at one file the filename was broken off because of an ENTER.

Omg big errors come from small causes I guess but now it all works again, I can't thank you enough mate, been struggling with this problem for 2 weeks but its finally solved, Thanks Again!