Hello apiwebservices,
I am really sorry to hear that you did not have a good experience with the member Import Utility. I agree, the error message is not all that helpful.
Would you mind telling me where the documentation let you down? We are always seeking to improve things around here and your feedback would be appreciated.
I would love to turn your experience with the utility around, if your up to keeping this thread open a little longer so I can do that, that would be great!
Right off the bat I see one roadblock that resulted in the failed process. The usernames cannot be an email addresses. Usernames must be a unique ID. So for each user, even if you use a plugin later that allows the user to login with their email address, the username must be changed to a unique name.
Also, for this process all required fields must be filled out. Even if the required field is empty, like a password. If the field is required and it’s not there, then the process will not complete correctly.
If there is anything else I can do to help, please let me know.
Oh one more thing, I suggest backing up your database, just to be safe.
Cheers,