Found a solution:
As enabling ANT instead of gradle gave me the same problem and all licences were already checked, I found an other solution:
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Go to NVPACK\android-sdk-windows\tools and run android.bat to execute the SDK-Manager (not the CodeWorks Manager)
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If anything is checked, deselect everything.
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Uninstall any installed Android SDK Build-tools
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Now install the Android SDK Build-tools with latest Revision (at the moment Rev. 28.0.3)
I also updated the Android SDK Tools and Android SDK Platform-tools
Now rebuild your Project and it should work without any errors!
Hope this is helpful
