colcon build error: can't copy 'resource/<pkg-name>': doesn't exist or not a regular file

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I am using ROS2 Humble in Pop!_OS 22.04 LTS.

This is very surprising to me. Until yesterday the package (beaming: I am making this package for my robot) was building fine. But today when I tried doing a colcon build it fails with the following error:

Starting >>> beaming 
 stderr: beaming                   
/usr/lib/python3/dist-packages/setuptools/command/install.py:34: SetuptoolsDeprecationWarning: setup.py install is deprecated. Use build and pip and other standards-based tools.
  warnings.warn(
error: can't copy 'resource/beaming': doesn't exist or not a regular file
Failed   <<< beaming [1.37s, exited with code 1]

Summary: 0 packages finished [2.06s]
  1 package failed: beaming
  1 package had stderr output: beaming

I made sure that I was sourcing the workspace before doing the colcon build. I found this issue similar to mine but the same error shows up even after deleting build/ and install/ directories as proposed in the solutions. Is this is an issue with the colcon tool or something local in my workspace? How do I fix this?

Thanks in advance.