Error while opening the Storyline Source file

I have both of these several times. One reason is from where the file is stored. Keep them on your hard drive. Storyline files don't like to be stored on the cloud, OneDrive or other places. The other reason I have gotten them is the way I tried to open them. I have noticed they like to be opened the same way each time. Now I open Articulate open first, then I find the story file and open it. If you just click on the file, it sometimes glitches on me. As for someone is using it, it should let you open an copy or make a copy. Then just resave it.

Good luck