name 'LpProblem' is not defined

The error message you mentioned suggests that the name 'LpProblem' is not defined in your current context. This error typically occurs when you are trying to use the LpProblem class from a library or module without importing it first.

To resolve this issue, you need to import the necessary module that contains the LpProblem class. In the case of linear programming, the LpProblem class is commonly found in the PuLP or scipy library.

For PuLP, you can import it like this:

from pulp import LpProblem

For scipy, you can import it like this:

from scipy.optimize import linprog

Make sure you have the required library installed and properly imported before using the LpProblem class.