Error Local Variable Type Mismatch, In Xamarin.android

I am trying to build a solution in Xamarin with an android library that I imported. The library come from a manufacturer called bbpos. I have the following error message : Error co

Solution 1:

In case it my help someone else i have finally found the solution.

It turns out the compiler was the problem.

I went to the Xamarin.Android Properties, then went to the Android Options tab. In the Dex compiler field I selected d8.