It seems that after upgrading to Mac OS Mojave + Xcode 10 it's not possible to debug custom views on Xcode. Always receiving the same message:
Ensure "IBDesignablesAgent-iOS" is not already running, and 'username' has permission to debug it.
Previously Xcode asked me for entering my credentials before debugging a custom view. Now it always fails. Is anyone experiencing the same issue? Is there any way to troubleshoot the problem in an effective way?