Look in your \cfgdayz\BattlEye directory, and there should be files named addbackpackcargo.txt and addbackpackcargo.log
You will need to look in addbackpackcargo.log for the entry showing the kick, and the number it gave you when you were kicked somewhat corresponds to the line number in addbackpackcargo.txt that you need to edit. I say somewhat because it considers line 1 to be line 0, so you need to start counting at 0 instead of 1, and its number does not include any lines that are blank or commented out.
From what I'm seeing in my addbackpackcargo.txt it looks like it is only kicking for banned weapons, so if there are banned weapons that you are able to spawn on your server then you'd been to comment out the line in addbackpackcargo.txt for that weapon so that people don't get kicked.
You will need to look in addbackpackcargo.log for the entry showing the kick, and the number it gave you when you were kicked somewhat corresponds to the line number in addbackpackcargo.txt that you need to edit. I say somewhat because it considers line 1 to be line 0, so you need to start counting at 0 instead of 1, and its number does not include any lines that are blank or commented out.
From what I'm seeing in my addbackpackcargo.txt it looks like it is only kicking for banned weapons, so if there are banned weapons that you are able to spawn on your server then you'd been to comment out the line in addbackpackcargo.txt for that weapon so that people don't get kicked.