Hi, I tested again and here is more information.
My Didnapper 2 version is v1.2.5 on Steam. The Overkill version I installed is Overkill-v0.16.1. The title screen shows “Overkill 2 Mod (v0.16)”, so the mod seems to load.
The error happens when I use Call Ally and choose any character. I get this error:
[PDX_EventCaller] The "RunEventPage" plugin command was called with "NaN" as event ID but this event doesn't exist.
I also get errors in the Chastity / Struggle menu:
TypeError: Cannot destructure property 'baseDiff' of 'undefined' or 'null'
And sometimes:
Failed to get binding properties: Binding None not found!
I also had other patches installed before, but I will test again with only Overkill installed to check if it is a mod conflict. I will also try a new save file, because maybe my old save is not compatible with the mod.
I attached screenshots of the errors.