A week ago, Google Analytics fixed a bug with content data reports, now they need to fix issues with Google Analytics users logging into their accounts.
There are several threads in the Google Analytics Help forum discussing how Google is displaying an error message when they login.
Googler, Christelle, said in a Google Analytics Help thread:
If you get this error message (Error Has Been Detected) when you click on the View Reports link, please add your username in the form at https://spreadsheets.google.com/viewform?key=pKyhdPcaY98d84kyJhdBELg
Your login email will be fixed within 24 hours (excluding weekends and holidays)
PS: Please do not post your email address here
So if you are seeing the message, "Error Has Been Detected," please go to the URL above and fill out the form.
Forum discussion at Google Analytics Help.