The error occur where I update the version from ICE3.2.1 to ICE3.4.2!

#include <Ice/Service.h>
namespace CRC{

class Server : public Ice::Service
{
................

};

int main(int argc, char* argv[])
{

CRC::Server app;//error C2259:The abstract class Cannot be Instantiated
......................
}

But when I run the same code in the ICE3.2.1 it can work without any error.
I guess the reason for this error is that I update the version from ICE3.2.1 to ICE3.4.2!
How can I solve this problem?
thanks very much .
ateng 2012.5.12

I have solve the problem.

error:bool Ice::Service::start(int,char *[],int &)”: is abstract.

//my code as follow:
class Server : public Ice::Service
{
public:
};

bool Server::start(int argc, char* argv[])
{}

I modify it as follow:

virtual bool start(int, char*[], int&);


It pass.