'NoneType' object has no attribute 'actualSolve'

This error message typically occurs when you are trying to call a method or attribute on a variable that has a value of None. Here are a few possible causes and solutions:

1. You may have forgotten to initialize the variable before calling the method. Make sure that the variable is assigned a value before you try to call a method on it.

2. The method you are trying to call may not exist on the object. Double-check the name of the method and make sure it is spelled correctly.

3. The object you are trying to call the method on may not be the correct object type. Check the documentation for the method and make sure you are passing in the correct object type.

4. It is also possible that the method you are trying to call is not defined or is not accessible. Double-check that the method is defined in the correct scope and that you have the necessary permissions to access it.

Once you have identified the cause of the error, you can take steps to fix it. This may involve initializing the variable, correcting the method name or object type, or making sure that the method is defined and accessible.