Problem with IWDMessageManager

Hi,

I am trying to display error message with IWDMessageManager and the code is

MsgMan.reportContextAttributeMessage(wdContext.nodePerso().currentPersonElement(),personAttr,IMessageExComp.MISSING_INPUT, new object[] , true);

I am getting error at IMessageExComp.MISSING_INPUT i.e; IMessageExComp is unressolved.

i tried ISimpleErrors as well still the same error.

Ay help will be appriciated.

Rashmi.