how should an error look like to fail a build?

I have checked Fail build if ->an error message is logged by build runner
I use this on a gradle build. The build runner is command line and the executable gradle.bat . The build fails but the status is successfull.
I wonder if I can trick the log parser to find an error and fail the build
The log contains lines like

[10:06:40]: [ERROR] BUILD ERROR
[10:06:40]: FAILURE:  Build failed with an exception.


[10:06:40]: BUILD  FAILED
[10:06:41]: Process exited with code 0
[10:06:36]: Build finished

and it is still successful

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