Error: This file has been locked by <username> for saving (due to shared file).

Error:

This file has been locked by <user name> for saving. Please try again later.

Cause:

The user is saving a shared workbook while another user is saving the same file. Excel locks the workbook during the save process. Another user cannot save the workbook until the save process has completed.

Solution:

Wait a few minutes after receiving this error message and save the file.