I have the same problem, but my path seems okay.
UATHelper: Packaging (Android (ETC2)): C:\Users\hello.gradle\caches\transforms-1\files-1.1\support-compat-27.1.0.aar\91d8725fb716b1145270400a7aae842d\res\values\values.xml:20:5-70: AAPT: error: resource android:attr/fontStyle not found.
UATHelper: Packaging (Android (ETC2)): C:\Users\hello.gradle\caches\transforms-1\files-1.1\support-compat-27.1.0.aar\91d8725fb716b1145270400a7aae842d\res\values\values.xml:20:5-70: AAPT: error: resource android:attr/font not found.
UATHelper: Packaging (Android (ETC2)): C:\Users\hello.gradle\caches\transforms-1\files-1.1\support-compat-27.1.0.aar\91d8725fb716b1145270400a7aae842d\res\values\values.xml:20:5-70: AAPT: error: resource android:attr/fontWeight not found.
UATHelper: Packaging (Android (ETC2)): Z:\app\build\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:94: error: resource android:attr/fontStyle not found.
UATHelper: Packaging (Android (ETC2)): Z:\app\build\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:94: error: resource android:attr/font not found.
UATHelper: Packaging (Android (ETC2)): Z:\app\build\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:94: error: resource android:attr/fontWeight not found.
UATHelper: Packaging (Android (ETC2)): error: failed linking references.
I don’t understand what could be the problem. It was working fine all the time.