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I've only seen this error when the ROS Prosilica node can't find the requested camera.

First thing to try: if SampleViewer is able to auto-detect your camera, prosilica_node should also be able to. Remove the ip_address parameter from your launch file, and make sure it's not still set on the parameter server. Then when you launch prosilica_node, it will open the first camera it finds.

I'd recommend checking out trunk of the camera_drivers stack for further trouble-shooting. Trunk fixes the prosilica_gige_sdk programs, and fixes the 'pure virtual method' nonsense so you get a backtrace for the actual error. You can use rosinstall with configuration

- svn: {local-name: camera_drivers, uri: 'https://code.ros.org/svn/ros-pkg/stacks/camera_drivers/trunk'}