Servo knee front right doesn't work

I have built a 4legs bot and the first servo kneefrontright doesn’t work. All other servos are ok.
Same result with any other servo.
Using sketch for servo centering on the same connector, It works.
Something is wrong with 4legs MIT sketch?
Could You Help me?

I use arduino UNO R3.

On what pin have you connected this servo? Is the shunt for that pin placed correctly?

Yes the shunt is correctly placed for UNO .
The servo is connecter on servo 1.

I did a small sketch just for this servo (disconnecting all other servo) and it works

OK the servo was connected to pin 1 and not 2.

No problem