Your build specification didn't have a startup VI selected, so I worked with what you provided.
My assumption is that the error you're seeing is represented below?
"Excute Process Driver.vi" in your "timerA.lvclass" for some reason is being required to have the front panel available once built into an EXE. I haven't had the change to really investigate why.
I found something interesting when I built your application with Debug enabled to troubleshoot. With debug enabled, the EXE executes without error.
So then, I went into the build spec and disabled debugging, and then un-checked "Remove front panel" for the troublesome VI, recompiled the EXE and again, no issues :
This is at least a workaround if it's something that's holding you up. I currently don't have the time to find the root cause, but someone else can take over if they want as I have to start my work day. Knowing myself the way I do, it may be something glaringly obvious that my coffee-lacking brain couldn't pick up on this early in my day.
I hope this helps!