Message

foo must be Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday

Explanation

day elements must be one of the following strings: "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", or "Sunday".

Solution

Fix or remove any day elements that are invalid.

Not clear? Disagree?

You might be able to find help in one of these fine resources.

Copyright © 2002-4 Mark Pilgrim and Sam Ruby