Endpoint not found with WCF .net 4.0 - asp.net

Question

I have been wracking my brain to get this one figured out. I followed the MSDN "Simplified Configuration" model here, for .net 4.0 - http://msdn.microsoft.com/en-us/library/ee358768.aspx
I get this error when I try and hit the URL - http://localhost:62392/GetBuildings.svc/GetBuildings?numberOfPeople=2,4&amountOfTime=1&needComputer=true&dateSelected=12/1/2012
The service seems to actually run, I don't get a full on IIS error, but I am not getting the data expected. How can I evaluate whether my endpoint is setup correctly?
my web.config -
<?xml version="1.0"?>
<configuration>
<system.web>
<compilation debug="true" strict="false" explicit="true" targetFramework="4.0" />
<authentication mode="None"/>
</system.web>
<system.serviceModel>
<behaviors>
<endpointBehaviors>
<behavior name="webHttpBehavior">
<webHttp/>
</behavior>
</endpointBehaviors>
<serviceBehaviors>
<behavior>
<serviceMetadata httpGetEnabled="True"/>
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
<bindings>
<webHttpBinding>
<binding name="webHttpBindingJsonP" crossDomainScriptAccessEnabled="true"></binding>
</webHttpBinding>
</bindings>
<protocolMapping>
<add scheme="http" binding="webHttpBinding" bindingConfiguration="webHttpBindingJsonP" />
</protocolMapping>
</system.serviceModel>
</configuration>
my Interface -
Imports System.ServiceModel
Imports System.ServiceModel.Web
<ServiceContract()>
Public Interface IGetLibrariesService
<OperationContract(Name:="LibraryData")> _
<WebGet(ResponseFormat:=WebMessageFormat.Json)> _
Function GetLibraries(ByVal numberOfPeople As String, ByVal amountOfTime As Integer, ByVal needComputer As Boolean, ByVal dateSelected As String) As BuildingReturnData
End Interface
and last, my code -
<DataContract()>
Public Class BuildingReturnData
<DataMember()>
Public libData As List(Of LibraryMobileData)
<DataMember()>
Public numberOfRooms As List(Of Integer)
<DataMember()>
Public totalRecordCount As Integer
End Class
<AspNetCompatibilityRequirements(RequirementsMode:=AspNetCompatibilityRequirementsMode.Allo wed)>
Public Class MeetingRooms : Implements IGetLibrariesService
Private _libData As New List(Of LibraryMobileData)
Private _roomCountData As New List(Of Integer)
Public Function GetBuildings(numberOfPeople As String, amountOfTime As Integer, needComputer As Boolean, dateSelected As String) As BuildingReturnData Implements IGetLibrariesService.GetLibraries
Dim libTemp As New LibraryMobileData
Dim startPeople, endPeople, recordCount As Integer
Dim numberSplitArr As String()
numberSplitArr = Split(numberOfPeople, ",")
startPeople = numberSplitArr(0)
endPeople = numberSplitArr(1)
For x = 0 To endPeople
libTemp.LibraryId = x
libTemp.Name = "library " & x
libTemp.Latitude = 39.167107
libTemp.Longitude = -86.534359
_libData.Add(libTemp)
_roomCountData.Add(x + startPeople)
recordCount = x
Next
Dim temp As New BuildingReturnData
temp.libData = _libData
temp.numberOfRooms = _roomCountData
temp.totalRecordCount = recordCount
Return temp
End Function
End Class