My dumbest mistake was when I was first times, making something with the editor and worked a long time with my first couple maps, well... couple times my editor crashed and I didn't saved. Well later I re-worked everything again... like 3-5 hours in one sit, finally I was like "Woah, this is really detailed and nice map with 300 lines of code, many areas, rooms..." well... then my phone was ringing, my friend asked me "Do you wanna hang out or do something with him" I thinked fast... and was like yeah, sure "why not" and ended conversation closed the window really quick and turned off my pc.
Tomorrow... I was working my maps again... hmm... I was like where my maps "NO, NO, NO, It can't be then the worst happened, I didn't save it at all! Just clicking fast "Exit" button and runned my errands.
Arrghh.. that was the most failing attempt I ever done when editing and making my own mod and now today I will remember to save, if I continue mod or make something and always SAVE! Remember ppl, when editing or doing something, SAVE your work for the love of god