Grader report error for not defined functions

I’m getting the following error from the grader regarding the first exercise, while all tests passed when code runs on notebook. The same code runs on colab as well.

Failed test case: is_palindrome_fixed thrown an exception when sentence = “I like bread”. Aborting unittest.
Expected:
is_palindrome_fixed should run for any string,
but got:
Exception thrown was: name ‘is_palindrome’ is not defined.

I checked again and again for possible indentation issues. Any assist?

I would recommend revisiting the implementation of the functions and reviewing them carefully based on the grader feedback. This might provide clues about where the issue lies.

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Thank you for the response. I found an obscure solution as I couldn’t extract any cryptic clue from the grader error messages.