Exception: Access violation at address 0040744F in module ‘SamsungToolPRO.exe’. Read

keep getting exception errors-tried resetting reflashing and 3 computers but same error. here is log:

Operation: Write CERT
Selected model: SM-N920T
Software version: 23.9

Waiting ADB device…
Please, allow USB debugging on phone… OK
Reading phone info…
Model: SM-N920T
Android version: 5.1.1
Product code: SM2N920TZKATMB
Phone version: N920TUVU2COI5
PDA version: N920TUVU2COI5
CSC version: N920TTMB2COI5
CSC country code: USA
CSC sales code: TMB
HW version: REV0.2
Phone S/N:
Modem board: SHANNON333
RF cal date: 20151026
IMEI:
Checking Super user right… true
Initialization AT RIL… OK
Checking certificate file… OK
KEY ID: 0448
Initializating zTool… OK
Running zTool, please wait… OK
Reading nv data… OK
Checking NV data… OK
Calculating…
Exception: Access violation at address 0040744F in module ‘SamsungToolPRO.exe’. Read of address 0C759CCC

Done with Samsung Tool PRO v.23.9

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