You have a stack overflow somehow. This is what happens when a function calls itself recursively in an infinite loop. Unfortuantely it appears you don’t have debug symbols installed so the log isn’t telling you what function it actually is.
UAT is Unreal Automation Tool - it’s part of the build system. Before doing anything, install the debug symbols from the launcher. Also, at the bottom you can see that it spat out another log file somewhere else, be sure to check that one too.