What are the common errors I must avoid to successfully upload bulk importer in the application?

Following are the common errors that you must avoid to upload bulk importer excel in the application:

1. Employee number must be in text format.
2. Effective Date in the importer excel must be in the correct format. The correct format is DD-MMM-YYYY.
3. Employee number should not be repeated.
4. Mandatory columns marked in red must not be deleted from the importer excel.