Python NameError: 'b' is not defined - Troubleshooting and Solution

The error message indicates that there is a NameError on line 4 of the code in the file "script.py". The name 'b' is not defined, which means that it has not been assigned a value before it is being used in the expression 'b%a'.\n\nTo fix this error, you need to define the variable 'b' before using it. For example:\n\npython\na = 5\nb = 10\nc = b%a\n\n\nMake sure to assign a value to 'b' before performing any operations on it.