According to the Wiimmfi error code lookup page, this is due to a communication error with the GPCM server during log in. I can only assume you weren't able to connect to the server, or there is some sort of authentication failure. If you consistently encounter this error code, posting your friend code might help moderators with troubleshooting.

There was a bug on Wiimmfi from about 12:58 UTC until 13:42 UTC today that has caused logins to fail for everyone on Wiimmfi, because the GPCM server (as mentioned in the error message) was unable to start.

Hey, sometimes these error descriptions are even accurate