Yup, my tutorial is fully applicable in this situation :tongue:
ModelDB is finicky, restore your original file to confirm that it is the source and then start editing again. Take care of line and faction counts (and the model count if it is a completely new model entry) and make sure to leave a SPACE at the end of each line. The latter can be easily checked if you use
Notepad++ with 'view\ show symbol\show white space and TAB': a space is shown as orange dot, a TAB (never use it in modeldB!) as orange arrow.