So I ran the Verify. Not sure what was supposed to happen but it completed without event.
In regards to the existence of the file that is causing the failed assertion:
If what is being printed to console is supposed to be an absolute URL to the file then I can see this being an issue.
The file does in fact exist on my machine and the absolute URL on my machine is the following:
/Users/Shared/EpicGames/UE_4.17/Engine/Source/Runtime/Core/Private/GenericPlatform/GenericPlatformProcess.cpp
the unreal console output is asserting that the file exists here:
File:/Users/build/Build/++UE4+Release-4.17+Compile/Sync/Engine/Source/Runtime/Core/Private/GenericPlatform/GenericPlatformProcess.cpp]
so it is checking in this non-existent extraneous folder called build in the Users directory.