faced similar error. downgrading isn’t feasible since I am using Vuforia plugin and there are syntax variations too.
I used the sample project by vuforia for unity to implement user defined targets based AR. I added GPS functionality to it using the attached script. The app is crashing after a few seconds. I, then, used adb logcat and printed it in a log file and now I am getting this error:
JNI DETECTED ERROR IN APPLICATION: jstring has wrong type: android.location.Location
Please see the attached script file: location.cs
and also the log file : log807pm_17feb.txt (specifically line number: 26845) that is where the error starts.