You have your version listed as 4.8, can I assume that you are using the 4.8.3 hotfix?
Have you attempted reverting the code changes that you made previous to this problem?
To fix the problem temporarily, can you try deleting your Binaries, Saved, and Intermediates folders and then Generate Visual Studio Project files? If you compile after this, you may be able to launch.
Have you tried later versions of the engine? We knew of multiple issues in 4.8 with Hot Reload that may be causing this which were fixed in 4.9.
We haven’t heard from you in a while. Have you had any chance to try 4.9 yet? If so, was it able to fix your issue? Please comment to let me know. In the meantime, I’ll be marking this issue as resolved for tracking purposes.