Building Python bot

when I add numpy to requirements.txt I get the following error(extract from build log) in the build log. Both the manual and automatic build processes fail.

ee[0me[91m ERROR: Failed cleaning build dir for numpy
e[0m Building wheel for msgpack ( started
Building wheel for msgpack ( finished with status ‘done’
Created wheel for msgpack: filename=msgpack-1.0.2-cp39-cp39-linux_x86_64.whl size=15818 sha256=771d4f3c702bde26cf02eac68dce8cf736e166cbb890640183716aec49b41c48
Stored in directory: /root/.cache/pip/wheels/30/52/01/57e347f8406cc2b7e19d8f94394d5b7cd51763f8620541a906
Successfully built msgpack
Failed to build numpy
Installing collected packages: urllib3, six, idna, chardet, certifi, websocket-client, requests, msgpack, signalrcore, numpy
Running install for numpy: started
Running install for numpy: finished with status ‘error’
e[91m ERROR: Command errored out with exit status 1:
command: /usr/local/bin/python -u -c ‘import sys, setuptools, tokenize; sys.argv[0] = ‘"’"’/tmp/pip-install-2trvkcgi/numpy_2b8e88d2a5bc43a595807f2d50ad3779/’"’"’; file=’"’"’/tmp/pip-install-2trvkcgi/numpy_2b8e88d2a5bc43a595807f2d50ad3779/’"’"’;f=getattr(tokenize, ‘"’"‘open’"’"’, open)(file);’"’"’\r\n’"’"’, ‘"’"’\n’"’"’);f.close();exec(compile(code, file, ‘"’"‘exec’"’"’))’ install --record /tmp/pip-record-1s2wyvz_/install-record.txt --single-version-externally-managed --compile --install-headers /usr/local/include/python3.9/numpy
cwd: /tmp/pip-install-2trvkcgi/numpy_2b8e88d2a5bc43a595807f2d50ad3779/
Complete output (271 lines):
Running from numpy source directory.

What am I doing wrong?

I removed numpy and used lists in stead of arrays. Bot now builds and runs.