Hi Halle, thank you very much for the quick reply.
I tried the tutorial process again with a fresh app, but ended up with the same result. (OpenEars works fine, again.)
I carefully added frameworks with the options described in the tutorial.
<selected options> (both for OpenEars and RapidEars)
– “Create groups for any added folders” is selected
– “Create folder references for any added folders” is NOT selected
– “Copy items into destination group’s folder (if needed)”
Actually, I have been already struggling with this error for days with another original app. Is there any sample app of RapidEars, maybe?