LVL dissapeared

So i had my lvl built but it dissapeared, but when I try to create one with the same name it says it already exists making me think it might not be lost? How do I fix this?

Also extra: I have an undeletable texture in my content browser how do i delete it?

i would try restarting your engine/pc. also try selecting the content folder and filtering for levels to see if its hiding somewhere in the wrong folder. its also possible it had an issue importing it so you may want to look in the content folder via windows explorer too.