Android For Distribution fails

Development Platform & Builds Mobile
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1

Everything just works fine accept when i select “For Distribution”.
I run my game happily on my Cardboard VR with an android 7.0 device, but can’t seem to get past:

[C:\NVPACK\android-sdk-windows\android-sdk-windows\platforms\android-24\android.jar] (Can’t process class [dalvik/annotation/TestTargetClass.class] (Unsupported class version number [52.0] (maximum 51.0, Java 1.7)))

I’m using 4.16.3, Androidworks 1R6u1, Api-24, proguard5.3.3, java 1.8.0_144-b01 and generated a keystore that matches the projectsettings.
Tried deleting folders, install APIs 21 to 24 , ran updates, everything i could find on this error but for me no difference.
Development, fine. Shipping, fine. Distribution, ERROR.

Please help?

2

Oops.
Resolved! It WAS the upgrade of proguard, but i seem to have a double android-sdk-windows folder and replaced in the wrong one.