I've got this problem in logs:

2 warnings found (use --debug to expand):

Aug 13 08:42:34

- UndefinedVar: Usage of undefined variable '$NIXPACKS_PATH' (line 18)

Aug 13 08:42:34

LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 18)

Aug 13 08:42:34

Aug 13 08:42:34

Dockerfile:20

Aug 13 08:42:34

-------------------

Aug 13 08:42:34

18 | ENV NIXPACKS_PATH /opt/venv/bin:$NIXPACKS_PATH

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19 | COPY . /app/.

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20 | >>> RUN --mount=type=cache,id=s/e93f6290-f7ba-49a6-afe3-e3c65d4cde30-/root/cache/pip,target=/root/.cache/pip python -m venv --copies /opt/venv && . /opt/venv/bin/activate && pip install -r requirements.txt

Aug 13 08:42:34

21 |

Aug 13 08:42:34

22 |

Aug 13 08:42:34

-------------------

Aug 13 08:42:34

ERROR: failed to solve: process "/bin/bash -ol pipefail -c python -m venv --copies /opt/venv && . /opt/venv/bin/activate && pip install -r requirements.txt" did not complete successfully: exit code: 1

Aug 13 08:42:34

Aug 13 08:42:34

Error: Docker build failed

Can someone please solve me this? I don't know what to do