HELP DUDES! no appropriate default constructor available

Hi all!

I'm trying to create my own class and call it from the appui class.

In my appUI class

void CMyAppUi::ConstructL()
    {

    BaseConstructL();

    iAppContainer = new (ELeave) CMyContainer;
    iAppContainer->SetMopParent( this );
    iAppContainer->ConstructL( ClientRect() );
    AddToStackL( iAppContainer );
 
    iMyClass = new (ELeave) CMyClass;
    iMyClass->ConstructL();

    }

I have declared
class CMyclass
class CMyAppUi : public CAknAppUi
.
.
.
private:
CMyClass* iMyClass;
.
.
.
in the AppUi.h


In my class that I create

CMyClass::CMyClass()
{

}

void CMyClass::ConstructL()
{

   iRecipient=HBufC::NewL(KMaxTelephoneNumberLength); // for recipient sms number
   iMsvId = NULL; // MsvId for keeping track of the message server entries.
   // Create CMsvSession
   iSession = CMsvSession::OpenAsyncL(*this); // new session is opened asynchronously
   
}



When I try to compile my AppUi class, I get this error:

'CMyClass' : no appropriate default constructor available
use of undefined type 'CMyClass'
.
.
.

Is there somtething wrong with the way I construct?
Please Help...

When will I use NewL and NewLC?