I decompress the file which is 01_LunaMV_SideviewTemplate of LunaEngineMV_V1.1.3. I did nothing to the file, even change the name. I open the project, everything is ok, but the save/load. I can only save one time when i don't save before. After that, i go back to the title, try to load, and get error.

My mv version is 1.6.2

Hi Oscar,  just delete the save files and it should work. It's because the save file is outdated!