When setting up LabQuest 2 for Gmail/Google Apps, I get an error.

This information pertains to LabQuest 2.
If you have an original LabQuest, see Original LabQuest Troubleshooting and FAQs (Full List)

When Gmail has received too many authentication requests in a short time period, a user account may become locked. This is sometimes listed as Error 77. See the text below for an error reference and a link to Google's support page for steps to correct the issue.

Server message:
535-5-7.1
Learn more at: https://support.google.com/mail/bin/answer.py?hl=en&answer=78754