VS 2008 - PageMethod Not Working "The Server Method Testing Failed"

I have a master page/content page going on in this situation. The page has two page methods that work, and they feed info to a pair of autocomplete extenders. The script manager on the Master Page has 'EnablePageMethods' set to true. The content page has a ScriptManagerProxy. The strange thing is that I have used this pattern on four other pages within the project.

<System.Web.Services.WebMethod()> _
Public Shared Function testing(ByVal uid As String, ByVal issn As String, ByVal journalName As String) As String
Return "true"
End Function

Here is the javaScript code:

function AddJournal(uid, issn, journalName) {
alert("uid: " + uid + " issn: " + issn + " name: " + journalName);
PageMethods.testing(uid, issn, journalName,
function(res) {
if (res !== "true") {
alert(res);
} else {
alert("The journal " + name + ", issn as " + issn + " was successfully entered.");
}
return;
},
function(res) {
alert("The journal database could not be accessed
" + res.get_message() + "
Status Code: " + res.get_statusCode() + "
Exception Type: " + res.get_exceptionType() + "
Please try again.");
});
}

The fail function is executed, and the status code is 0 (zero), and the exception type is an empty string. I can change the function with no parameters, and I get same error. I can the leave the parameters at three on the VB side, and change the parameters to two on the client side; then I do not get the error message, but none the other alerts are executed.