The CSV Import for project fails even after preparing the file as per the defined guidelines.

The project might have a user defined field which is a mandatory field and the import file might have the user defined field field or data.

Add the required user defined fields into the CSV file. Ensure that the values correspond to the way the user defined field is setup. For example, if the user defined field is of type drop-down, then the value provided in the CSV file must be an option available in the drop-down list. If the values do not match you will again receive an error for the same.