The mod I made to error.e is very simple, just let it activate messages window if there were something wrong in building:
at the end of set_error_markers():
if (err_count > 0) {
activate_messages();
}
Then I just save error.e, and load it with the load command (I also tried the gui-load). That's all, this simple mod did not work. So I add a say("Hello!") at the beginning of set_error_markers(), then load and run set-error-markers, nothing printed.
I tried the -sc to start with factory settings, then load the error.e again, and seems the mod did not be applied after loading the error.e, too.