N950u error calulating took 5 credit

PLS REFUND OPERATION WAS UNSUCESSFUL


[ 8/2/2018 2:30:13 PM ] Checking Login and Password... OK
[ 8/2/2018 2:30:15 PM ] Ballance: 50 crd.
[ 8/2/2018 2:30:20 PM ] You have 50 credit(s) left. This operation takes 5 credits.Continue? Yes
[ 8/2/2018 2:30:23 PM ] Waiting ADB device... OK
[ 8/2/2018 2:30:24 PM ] Reading phone info...
[ 8/2/2018 2:30:25 PM ] Model: SM-N950U
[ 8/2/2018 2:30:25 PM ] Android version: 8.0.0
[ 8/2/2018 2:30:25 PM ] PDA version: N950USQS5CRF6
[ 8/2/2018 2:30:25 PM ] CSC version: N950UOYN5CRF6
[ 8/2/2018 2:30:26 PM ] Phone version: N950USQS5CRF6
[ 8/2/2018 2:30:26 PM ] Product code: SM2N950UZVAATT
[ 8/2/2018 2:30:26 PM ] CSC country code: USA
[ 8/2/2018 2:30:27 PM ] CSC sales code: ATT
[ 8/2/2018 2:30:27 PM ] Phone SN: R38K109GNWP
[ 8/2/2018 2:30:27 PM ] IMEI: 351823093109387
[ 8/2/2018 2:30:28 PM ] HW version: REV1.0
[ 8/2/2018 2:30:28 PM ] RF cal date: 2018.01.19
[ 8/2/2018 2:30:28 PM ] Chip name: MSM8998
[ 8/2/2018 2:30:29 PM ] Modem board: MSM8998
[ 8/2/2018 2:30:29 PM ] Security patch: 2018-07-01
[ 8/2/2018 2:30:29 PM ] Boot Warranty bit: 0
[ 8/2/2018 2:30:32 PM ] Rebooting phone... OK
[ 8/2/2018 2:30:38 PM ] Waiting ADB device... OK
[ 8/2/2018 2:31:02 PM ] Rebooting phone... OK
[ 8/2/2018 2:31:08 PM ] Waiting ADB device... OK
[ 8/2/2018 2:31:34 PM ] Waiting for device to become ready... OK
[ 8/2/2018 2:31:38 PM ] Initialization zTool... OK
[ 8/2/2018 2:31:43 PM ] Running zTool, please wait...
[ 8/2/2018 2:31:46 PM ] Start... OK
[ 8/2/2018 2:31:49 PM ] Initialization... OK
[ 8/2/2018 2:31:51 PM ] Generate and check client proof... OK
[ 8/2/2018 2:31:51 PM ] Verify proof by client... OK
[ 8/2/2018 2:31:51 PM ] Reading data from phone... OK
[ 8/2/2018 2:31:58 PM ] Searching Ramdump interface... COM14 detected
[ 8/2/2018 2:32:57 PM ] Reading data from phone... OK
[ 8/2/2018 2:33:07 PM ] Calculating... error (0)