An issue specific of Xamarin Forms Android (didn't fit the title, sorry).
This is a new issue, I think. at least is recent enough to appear in our older projects while our newer ones work fine.
I searched this on Google but none of the solutions worked (deleting the contents of 'bin' and 'obj', cleaning the project and restarting Visual Studio for Mac is the most common, but to no avail).
I'll include the files the bug (or whatever it is) happens.
The first one is the 'Xamarin.Android.Common.targets', the issue is as follows:
"/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(2479,3): error APT0000: failed processing manifest."
The next file is a txt of an 'Android.Manifest', but is not the one in the project, just another one we found inside the 'obj' folder in the 'Droid' section of the project. The problem in this one is:
"error APT0000: resource integer/google_play_services_version (aka com.softoursistemas.rutesc.droid:integer/google_play_services_version) not found."
where 'com.softoursistemas.rutesc.droid' is the name of the 'Droid' project.
We must find a solution as soon as possible, so to continue with our work.
Thank you and best regards in advance.
ManuelR.