EN.ADMIN.ERROR_LOADING? what does meaning of this error?

I got this error when importing locations file in primero v2.13 how fix it? pls help.

Hello, did you follow the guidance in the admin guide to ensure the locations export is formatted correctly and has the correct file type? See guidance in the admin guide: https://support.primero.org/assets/books-v2/1sP6VhT70WHhi5ZPbio6EszX-i4jZsBkO/#h.ve2sr6nxj8s2