Sure
But this also happens when testing it in your demo with just your plugin.
I unfortunately don't get an error code. I just get the error sound when trying to save.
But I get this when entering DataManager.saveGame(1); in the console:
Viewing post in Souls Status Bars - RPG Maker MV/MZ Plugin comments
Apologies for the delay, we were hoping to roll out this bug fix along with the next wave of features for the Version 1.1.0 of this plugin but that's taking a longer than expected given our current resources. If you need us to expedite the patch for this specific issue, we can make it available to you by this coming weekend as a minor update.