It shows error when i save the file

anyone knows where is the problem , i cant save files .when i save it shows this

Hey, could you share your exact versions of OS and Lunacy, please?

Hello there,
I have understood your problem. I want to know that which operating system you’re using. If you are using MAC then solve your problem by follow the instructions below.
Choose Apple menu > Force Quit , select the app in the dialog that appears, then click Force Quit. If the app quit, reopen it by clicking Reopen in the dialog that appears. Restart your Mac by choosing Apple menu > Restart. Make sure the app is compatible with your version of macOS.