# Modbus tcp errors

**URL:** <https://forum.inductiveautomation.com/t/modbus-tcp-errors/21340>\
**Category:** Ignition\
**Created:** [December 11, 2018, 5:31pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp-errors/21340 "2018-12-11T17:31:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mcarritt1](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mcarritt1/32/4262_2.png) [@mcarritt1](https://forum.inductiveautomation.com/u/mcarritt1)\
**Post date:** [December 11, 2018, 5:31pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp-errors/21340/1 "2018-12-11T17:31:22Z")

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My logs are full of these messages, but I cant figure out which device is causing it. How can I find out which devices are causing these errors?

> INFO | jvm 2 | 2018/12/11 11:18:55 | E [d.M.ReadInputRegistersRequest] [17:18:55]: Uncaught Throwable handling response. key=java.lang.Object@213e45dd, req=, rsp=[00 01 01 00 50 74]  
> INFO | jvm 2 | 2018/12/11 11:18:55 | java.lang.ArrayIndexOutOfBoundsException: null  
> INFO | jvm 2 | 2018/12/11 11:18:56 | E [d.M.ReadInputRegistersRequest] [17:18:56]: Uncaught Throwable handling response. key=java.lang.Object@213e45dd, req=, rsp=[00 04 B4 00 2B 00 00 00 2C 00 2B 00 00 00 00 00 00 00 00 01 67 9D 09 73 9F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 40 67 7F 0C 40 60 9E 43 5D 46 21 62 00 00 00 00 00 00 00 00 00 0B 00 1F 42 C7 B7 38 00 17 00 3B 42 C7 FE D1 46 2A 4D 6D 42 A5 E5 3F 46 BC 15 C6 46 04 CB 4D 46 BB EF 9E 46 03 DF BC 43 01 56 13 43 01 40 AB 42 C3 84 AA 60 7C]  
> INFO | jvm 2 | 2018/12/11 11:18:56 | java.lang.ArrayIndexOutOfBoundsException: null