What does the error message "Parameter 'entity' cannot be null" mean?

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The error message "Parameter 'entity' cannot be null" usually means that in a function or method, a required parameter named 'entity' was not provided or was invalid, resulting in a null value. The code is expecting a valid entity object as an argument, but it received a null value instead. This error can occur when the code is not properly initialized, or a passed variable doesn't meet the necessary criteria.