I checked allow unknown sources app to be installed.

java.lang.RuntimeException: Unable to get provider mono.MonoRuntimeProvider: java.lang.RuntimeException: Unable to find application Mono.Android.Platform.ApiLevel\_24 or Xamarin.Android.Platform!E/AndroidRuntime( 8048): at android.app.ActivityThread.installProvider(ActivityThread.java:5571)E/AndroidRuntime( 8048): at android.app.ActivityThread.installContentProviders(ActivityThread.java:5163)E/AndroidRuntime( 8048): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5103)E/AndroidRuntime( 8048): at android.app.ActivityThread.access$1600(ActivityThread.java:177)E/AndroidRuntime( 8048): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1510)E/AndroidRuntime( 8048): at android.os.Handler.dispatchMessage(Handler.java:102)E/AndroidRuntime( 8048): at android.os.Looper.loop(Looper.java:145)E/AndroidRuntime( 8048): at android.app.ActivityThread.main(ActivityThread.java:5951)E/AndroidRuntime( 8048): at java.lang.reflect.Method.invoke(Native Method)E/AndroidRuntime( 8048): at java.lang.reflect.Method.invoke(Method.java:372)E/AndroidRuntime( 8048): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1388)E/AndroidRuntime( 8048): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1183)E/AndroidRuntime( 8048): Caused by: java.lang.RuntimeException: Unable to find application Mono.Android.Platform.ApiLevel\_24 or Xamarin.Android.Platform!E/AndroidRuntime( 8048): at mono.MonoRuntimeProvider.attachInfo(MonoRuntimeProvider.java:38)E/AndroidRuntime( 8048): at android.app.ActivityThread.installProvider(ActivityThread.java:5568)E/AndroidRuntime( 8048): ... 11 moreE/AndroidRuntime( 8048): Caused by: android.content.pm.PackageManager$NameNotFoundException: Xamarin.Android.PlatformE/AndroidRuntime( 8048): at android.app.ApplicationPackageManager.getApplicationInfo(ApplicationPackageManager.java:305)E/AndroidRuntime( 8048): at mono.MonoRuntimeProvider.attachInfo(MonoRuntimeProvider.java:32)E/AndroidRuntime( 8048): ... 12 moreV/ApplicationPolicy( 3137): isApplicationStateBlocked userId 0 pkgname com.mycomp.test1W/ActivityManager( 3137): Force finishing activity com.mycomp.test1/md5414c3d8510d5c9d2b651f345e03d9f02.SplashScreenActivityE/android.os.Debug( 3137): ro.product\_ship = true 

my app installs in all my devices.. inclucidn development and non-developmetn devices

but its not installing in the my client's devices