This is the same problem I found in counstruct3 as I edit my project at evening and at night I again try to open a the project its say fail to open c3 project.
someone please help me I have to upload this project tomorrow. this problem show Manny time I made the same project 3 time newly because of this issues but now I Don't want make new project again. Please help me the last things I did that I add a background image only.