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There could be different reasons why you are getting this error. Here are some possible causes and solutions:

1. Incorrect function call: Make sure you are calling the function with the correct syntax and parameters. Check the function definition to see how many arguments it expects and their names.

2. Undefined variable: Double-check that the variable you are passing as an argument is defined and has a value. If the variable is not defined or is None, you will get this error.

3. Incorrect object type: Some functions may only accept certain types of objects as arguments. Make sure the object you are passing is of the correct type.

4. Incorrect scope: If the function is defined in a different scope from where it is called, you may need to pass a reference to the function or import it into the current scope.

5. Overriding built-in functions: Avoid using the same name as built-in functions or keywords to define your own functions or variables. This could cause unexpected behavior or errors.

If you are still having trouble resolving the error, you may need to provide more information about your code and the specific function causing the error.