Error in my project. The error is ufunc 'subtract' did not contain a loop with signature matching types (dtype('<U32'), dtype('<U32')) -> dtype('<U32')

I am looking for a skilled Python developer to help me fix an error in my Machine Learning project. The error I am encountering is related to the ufunc 'subtract' not containing a loop with signature matching types (dtype('<U32'), dtype('<U32')) -> dtype('<U32') in the NumPy library. The ideal candidate should have experience with Python, machine learning, and the NumPy library. The project requires the following skills and experience:

- Expertise in Python programming language
- Strong understanding of Machine Learning concepts
- Experience with NumPy library
- Ability to troubleshoot and fix errors in code
- Good communication skills to work collaboratively with me.