VRbot + RF module using Arduino

The jumper appears to be in the SW position, which means that the shield is using pins 12 and 13 to communicate with the Arduino. The radio appears to be connected to pin 3.

The virtual wire library defaults to pins 10, 11, and 12. So, the use of pin 12 is in conflict. Which explains your problem. Even though you are not using the tx pin to transmit, you still need to tell the virtual wire instance to use another pin, and you need to do that BEFORE you tell the EasyVR shield to use pins 12 and 13.