Exception: no preinstalled buildpack found: heroku/gradle

[Stefan_Probst]

#8 [builder 2/1] COPY --chown=1000:1000 . /app/
#8 DONE 0.3s

#9 [builder 3/1] RUN /render/build-scripts/apply-buildpacks.py heroku-22
#9 0.222 Traceback (most recent call last):
#9 0.222   File "/render/build-scripts/apply-buildpacks.py", line 75, in <module>
#9 0.222     raise Exception(f"no preinstalled buildpack found: {ub_entry}")
#9 0.222 Exception: no preinstalled buildpack found: heroku/gradle
#9 0.222  - heroku/nodejs
#9 0.222     - preinstalled buildpack detected
#9 0.222  - heroku/gradle
#9 ERROR: process "/bin/bash -c /render/build-scripts/apply-buildpacks.py ${HEROKU_STACK}" did not complete successfully: exit code: 1
------
> [builder 3/1] RUN /render/build-scripts/apply-buildpacks.py heroku-22:
#9 0.222 Traceback (most recent call last):
#9 0.222   File "/render/build-scripts/apply-buildpacks.py", line 75, in <module>
#9 0.222     raise Exception(f"no preinstalled buildpack found: {ub_entry}")
#9 0.222 Exception: no preinstalled buildpack found: heroku/gradle
#9 0.222  - heroku/nodejs
#9 0.222  - preinstalled buildpack detected
#9 0.222  - heroku/gradle