str() argument 2 must be str, not numpy.int32

This error occurs when you try to concatenate a string with an integer using the str() function. The argument passed to the function must be a string, but in this case, it is a numpy.int32 integer.

To fix this error, you can convert the integer to a string using the str() function before concatenating it with the other string. Here's an example:

import numpy as np

a = np.int32(10)
b = "The value of a is: " + str(a)
print(b)

Output:

The value of a is: 10