Game crashes when i click 'Launch this level on PC' HELP!

When i click to test the game it gives me this error:

As long as it gets fixed, im happy because its really a major issue…
Thanks!

Howdy Yiannis,

Thank you for reporting this issue. We have been able to reproduce this error internally. This error has been previously reported as Jira UE-15769 and has been fixed but has yet to implemented into a release build. I am unsure as to when this will be implemented but I will be sure to keep you posted when I know more.

Thanks and have a great day!