I am unable to complete the Module 2 graded assessment in the Retrieval Augmented Generation (RAG) course because the grader reports that “BM25_RETRIEVER” is not defined. However, this variable is already provided as a pre-defined global variable in the assignment.
Additionally, all test cases pass successfully in the lab environment, but I still receive a total score of 0 in the graded assessment.
For reference, I have attached screenshots showing the error message and the successful test case results. Can anyone help me to solve this?



