TRXHOPINDEX Issue

Hello dears
I have an issue when trying to enable “Dynamic Multiple CCCHs” feature
Before enabling feature i must disable hopping on the timeslots that will be dynamically converted t CCCH, by changing TRX hopindex of this timeslots to 255

But everytime i get this error during activation of cell (cell must be deactivated before changing hopindex and then activated again)

“ACT GCELL: IDTYPE=BYID, CELLID=693, TRXIDTYPE=BYID;
FTBSC01
+++ UMTS-GSM 2021-07-27 15:42:15
O&M #14814300
%%/*1879143178*/ACT GCELL: IDTYPE=BYID,CELLID=693,TRXIDTYPE=BYID;%%
RETCODE = 235233410 The [GCELLMAGRP] that corresponds to the frequency hopping index of channel [2] on TRX [3446] for cell [******] does not exist. Check whether the configured frequency hopping index is correct.

— END”

And the main script as below

“DEA GCELL: IDTYPE=BYID, CELLID=693;

SET GTRXCHANHOP: IDTYPE=BYID, TRXID=3462, CHNO=2, TRXHOPINDEX=1, TRXMAIO=0;
SET GTRXCHANHOP: IDTYPE=BYID, TRXID=3446, CHNO=2, TRXHOPINDEX=255, TRXMAIO=0;

ACT GCELL: IDTYPE=BYID, CELLID=693, TRXIDTYPE=BYID;”