Include the file path and first bytes of file in the error message in case aconfig fails to parse one of the protobuf files. Example output: $ adb shell printflags Error: failed to parse /vendor/etc/aconfig_flags.pb ([0a], 1 byte(s)) Caused by: Unexpected EOF Bug: 304278614 Test: atest printflags.test Change-Id: I18ff88bd25d72dd477c4b11a32505e75884906ee