Question : TOM TOM SDK Integration c#

I have installed tomtom naivgator 6 on a Orbit XDA running windows mobile 6 Professional
I also have the TOMTOM SDK version 6 and have included it in a windows mobile device application in C#.
Most functions are working fine ( i can start the tomtom application , navigate to an address , switch modes etc..)

However i cannot get it to navigate to a long\lat value that i need to pass in
TTN.NavigateToCoordinates(ref tE,longatidude,lat, "Dublin");

I keep getting either error code -4 or -5
Does anyone know what these error codes mean or is there any known issues with this call in the SDK?

Answer : TOM TOM SDK Integration c#

The issue was that the verison of the SDK and tomtom navigator i was running had a known bug when calling this function
To resolve the issue i downloaded the latest verions of navigaor 6.031 and also got the latest verision of the helper dll 6.3.6