Same problem here; leads to massive load on the server when also using cacheing plugins as they endlessly try to retrieve the file.
Workaround for now seems to be to create the file at the location (i.e. css/mep_re_style.css inside the plugin directory). But for a long-term solution the plugin should create the file itself, even if it’s empty or don’t enqueue the style inside inc/MPWEM_Dependencies.php line 164 (inside frontend_enqueue ).
