repeat animation problem solved

hello

 i have an animation of a character raising arms up and down, I  put the extend mode to cyclic and expected it to go up and down,  but after the first cycle, only  one arm goes up and down and the other side is completely neglected,  can anyone give me a suggestion as to what might be the problem???

Revised: I found out the problem , i just didn’t do control A with the armatures