When I try to access google docs GData API, It is saying,

Constructor on type 'Google.GData.Spreadsheets.SpreadsheetsService' not found.

?loBridge.loadassembly("C:\Program Files\Google\Google Data API SDK\Redist\Google.GData.Spreadsheets.dll") is true
?loBridge.createinstance("Google.GData.Spreadsheets.SpreadsheetsService")
is NULL

Can you tell me what is the wrong here ?