"non-virtual thunk to ...." error in iOs

Question

In my iPhone app i am getting the following error:

"non-virtual thunk to metaio::UnifeyeMobileiPhone::UnifeyeMobileiPhone()"

and the point where the error occured is:

- (void)dealloc
{
    // Tear down context.
    if ([EAGLContext currentContext] == context)
        [EAGLContext setCurrentContext:nil];

    // delete unifeye instance
    if( unifeyeMobile )
    {
        delete unifeyeMobile; //here got the error
        unifeyeMobile = NULL;
    }

    [context release];

    [glView release];
    [super dealloc];
}

I googled for a solution for this issue, and I got something in this link. And there it says that this error is a "compiler bug". I have changed the Debug mode to Release and tested, but still having the issue. Any idea? And I am having this issue only on iPhone 4S. On iPhone 3GS it is working fine.