UE4 4.3 crashes after being built. What is this message?

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It finished building no errors, then this popped up just after I hit F5

In the out put window I see a lot of “Cannot find or open the PDB file” for many dll’s listed in Windows\System32\

Bump, I’ve decided to try and reinstall everything and give it another go but I think this one is rather important and could use an explanation if anyone has one.

Hi ,

Are you still having trouble with this issue?

I did the Github steps over again and got it working. Not sure what caused it but it’s now okay.