In terms of things we would try normally in this type of situation... It would be to check every other plug-in that is in your app and turn it off including as many of the ones that come “standard“ in an appery Build ... thus possibly identifying where one plug-in might conflict with another...
You might also try... After you have done what’s above... And if you had not had any success... You might try doing a back up completely... And then reverting your Appery.io libraries version back one.
If either of the above approaches is Successful... Then try adding things back one at a time and building one at a time...
Of course along the way you may need to comment out some of your application code or potentially try to start with a shell application and put in only the one signal plug in...
Just some ideas we would try If faced with the same challenge
Best,
Bruce