Missing classes error when trying to build an android APK

Issue When trying to generate an APK file fro an android app, I get these errors: Missing class com.android.org.conscrypt.SSLParametersImpl (referenced from: void org.conscrypt.KitKatPlatformOpenSSLSocketImplAdapter.<init>(org.conscrypt.AbstractConscryptSocket)) Missing class com.gemalto.jp2.JP2Decoder (referenced from: android.graphics.Bitmap com.tom_roush.pdfbox.filter.JPXFilter.readJPX(java.io.InputStream, com.tom_roush.pdfbox.filter.DecodeOptions, com.tom_roush.pdfbox.filter.DecodeResult)) Missing class org.apache.harmony.xnet.provider.jsse.SSLParametersImpl (referenced from: void org.conscrypt.PreKitKatPlatformOpenSSLSocketImplAdapter.<init>(org.conscrypt.AbstractConscryptSocket)) Missing

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