T-SQL and CLR types for return value do not match

Question

Hi I am trying to create a CLR function to call a webservice, the CLR function return data type is double, whether I try
to create this as a table valued funcion or a scalar to return a distance travelled value I am receiving the error below. I've tried changing data types around in the CLR side and the SQL side but keep receiving the same error message, any help would be appreciated,
Thank you,
[Microsoft.SqlServer.Server.SqlFunction(Name = "DistanceCalc")]
public static Double DistanceCalc(Double SrcLat, Double SrcLong,
Double DestLat, Double DestLong)
MileageWS ws = new MileageWS();
ws.Url = "http://test.isp.ca/Distance.asmx";
int intUom = 0; // 0 = Mile, 1 = KM
RouteType RouteMethod = RouteType.Practical;
Requester RequestedFrom = Requester.LinkRoute;
Double distance;
distance = ws.GetDistanceInfoForLonLat(SrcLat, SrcLong, DestLat, DestLong, intUom, RouteMethod, RequestedFrom);
return distance;
CREATE FUNCTION DistanceCalc
@SrcLat as float, @SrcLong as float,
@DestLat as float, @DestLong as float
RETURNS TABLE (Distance float)
External NAME CLRfunctions.RIFunctions.DistanceCalc
GO
Error received when try to Create function ...
1, Level 16, State 2, Procedure pcMiler, Line 6
CREATE FUNCTION for "pcMiler" failed because T-SQL and CLR types for return value do not match.

Answer 1

You defined at table-valued CLR function, but I think you meant to define a scalar CLR function. That might be the cause of the error.
RETURNS TABLE (Distance float)
should be
RETURNS (Distance float)