Error statement

In an Error statement what does “redefinition” mean? What do I have to do to fix it?

Here is my config code -

For the first 3 lines it says redefinition of …motor
vex::motor Backleftmotor(vex::PORT1, vex::gearSetting::ratio18_1,false);
vex::motor Backrightmotor(vex::PORT2, vex::gearSetting::ratio18_1,false);
vex::motor Arm1(vex::PORT3(vex::PORT3,gearSetting::ratio18_1,false);
vex::motor Arm2(vex::PORT4(vex::PORT4,gearSetting::ratio18_1,false);
vex::motor Claw1(vex::PORT5(vex::PORT5,gearSetting::ratio18_1,false);
vex::motor CLaw2(vex::PORT6(vex::PORT6,gearSetting::ratio18_1,false);