When starting Arma 3 from Stream library the launcher starts up normally for something like 10 seconds. After this an error message shows up saying "Unexpected error occurred: Object reference not set to an instance of an object. Details are stored in a text file on your desktop." (TEXT FILE CONTENTS IN ADDITIONAL INFORMATION)
However the launcher ONLY closes if you close the error message. If the error message is ignored by not clicking on it, Arma 3 can be launcher normally and the launcher is fully functional.
Steps I've tried to fix this:
- Verifying the Arma 3 files by using Steam