I encountered this problem while following the tutorial to install vllm-FL.
https://github.com/flagos-ai/FlagScale/blob/main/examples/robobrain2_5/README.md
Install vLLM and Transformers
git clone https://github.com/flagos-ai/vllm-FL.git
cd vllm-FL
pip install packaging==24.2
pip install --no-build-isolation .
pip install transformers==4.57.0
Solution
The solution is to install the following libraries. This was not mentioned in the documentation.
pip install setuptools_scm setuptools wheel packaging