TLDR: no problem after restoring original files, might've been rooted in other edits.
Hello, thanks for getting back to me, the syserr used to happen when a new guild was created, invested exp for it to be able to choose a logo and then restarting the client without choosing any logo. However, I also modified src for a system, so I assume that might've had something to do with it because now, after restoring the original files, no syserr comes up when recreating the previous steps.
I would also like to ask about this binary output when rebuilding:
Is this a problem?