Ladybug Error Generate test points by Grid size

Hello everybody, i’m new and struggling with Dynamo, I’m doing a simple exercise and should be easy, but i’m stuck on one error and don’t know how to solve it, please can someone help me, you can see the pic.

I have this problem too , my lb generate test points has an error that said failed to import ladybug ! And just this type of lb extra part has this problem , can you help me ?