Error message unclear: "Passwords must have at least one non letter or digit character."

Apologies if this has already been mentioned, I wasn't able to find anything online about it other than when it was mentioned, and pretty much ignored, here (first post by centiva): http://blogs.msdn.com/b/webdev/archive/2006/05/05/590585.aspx?PageIndex=270  

Came across this issue when completing this lab: http://www.asp.net/web-api/tutorials/hands-on-labs/build-a-single-page-application-(spa)-with-aspnet-web-api-and-angularjs

Using Microsoft.AspNet.Identity.UserManager, and specifically Microsoft.AspNet.Identity.PasswordValidator.

With PasswordValidator set with the property

RequireNonLetterOrDigit = true

Passwords must contain a non-letter AND non-digit character, i.e. a symbol

So

"Test123" is not allowed

"Test123@" is allowed

Unfortunately the wording of the error message is unclear:

"Passwords must have at least one non letter or digit character."

'non letter or digit' suggests to me that the password cannot be all letters, it must contain a symbol or a digit.

It is ambiguous because it is not clear whether it is:

non (letter or digit)

or

(non letter) or digit

Perhaps the wording should be changed, something like:

"Passwords must have at least one non-letter or non-digit character."

or

"Passwords must have at least one character that is not a letter or digit."

or

@"Passwords must have at least one special character: ~`!@#$%^&*()-_+={}[]|\;:<>,./?"

Thanks,

Adam