method is not a member of webservice class exception in ax2012

1) consuming webservice through C# library project in AX2012r3

2) x++ does not give an error during compilation

3) during runtime it will throw and exception saying "methodname" is not a member of "webserviceclass" -- which is not true. I can see that method in that service in visual studio and it lets me choose that method in x++

just wondering what kind of solution you used on visual studio or on ax side. please let me know

Thank you,

Dp_ax