These lines from your log seem to be the issue:
The errors that are not letting the level be made are “unresolved external symbol” errors meaning that some class or classes are being used but never defined. I am betting that you either have a bad Unreal install or you somehow deleted some of these libraries that Unreal needs. From the launcher, go to the Unreal Engine tab the select Library from the left pane. In the window find your Unreal install under Engine Versions. There is a yellow down arrow, pull it down and select verify and let us know what it says.