How do i save a mod I just altered

[Mercanrise]

Okay, i made my mod for Mechanist Forge pretty cool btw. If i Learn how to convert esp to 7zip I'll release it but on one item I mistakenly put a item into a wall kind of meshed and i was so satisfied with the rest didnt want to start over. but its already in the data folders and everything I was wondering how can i alter my mistake and save it every time i do I load my mod and set it as active file with the fallout master file as well but when i save it it gives me a error message something about name issues and it deletes the mod and when i try to save it again the G.E.C.K shuts down or crashes and i have these issues with oblivion construction set please help someone