Multiple errors found VS multiple errors were found

[Avian]

I'm writing a website where people can enter data and I want to show an error message if the data is incorrect.
I am debating whether the error should be "multiple errors found" or "multiple errors were found". The first sounds better to me even though the second seems more proper.
What's the way to go here?

[Alan]

Yes, the second is fully formed, but the first would serve as a perfectly comprehensible abbreviation!