Here is problem- I didn't know how to ensure if my mod is clean, how to do this? I couldn't delete Falskaar.esm from the right, above my mods name (among other esms). 'ensure it's clean of all traces of Falskaar.esm, then right click it and select 'Clean Masters'. If it would be a simple cave, dungeon I would begin from scratches, but it already cost me so much work, and this is a main place, undergound city for my mod. Of course I didn't use, didn't copy anything from Falskaar, stupid accident. I tried to make new esp and copy paste the interiors, but when I save it, it automatically needs Falskaar.esm as one of needed, required to work files. When I remove it, I cannot even load,start game.
And now my mod requires Falskaar.esm (only esm, I checked and remove manually all the of other files from Alexander's V. I don't know how, why,when but once I had to check 'Faalskar.esm' when I was working on my mod and saving it.