Query the sum of row values in sqlite on with Xamarin

Hello guys. Am trying to the sum of row values of sqlite database. My sqlite table has a row called Amount. So what I want is to sum all the Amount values on the table. This is my code :

public async Task SumItemAsync()

{

var data = await db.ExecuteScalarAsync("SELECT SUM(Amount) FROM Spent");

return data;

}

but it.s giving me an error saying "the type arguments for method sqliteAsyncConnection.ExecuteScalarAsync(string, param object[]) cannot be infered from the usage. Try specifying the type argument explicitly" . Any help.