# Uncaught Throwable during messageArrived() **URL:** \ **Category:** Ignition\ **Tags:** ignition81\ **Created:** [November 17, 2021, 9:40pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-during-messagearrived/53211 "2021-11-17T21:40:15Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Daniel\_Morano](https://avatars.discourse-cdn.com/v4/letter/d/f475e1/32.png) [@Daniel\_Morano](https://forum.inductiveautomation.com/u/Daniel_Morano)\ **Post date:** [November 17, 2021, 9:40pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-during-messagearrived/53211/1 "2021-11-17T21:40:15Z")
![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/c/0c8bedad6faa92df060155fa82d70e8975ac11c1.png) When trying to pull coil data through Modbus the above errors, are present in the log activity for the specific OPC-UA device connection. These errors are not present when polling data from holding registers only coil data. The target coil data seems to be present when polling using a different software. I am looking for some guidance on what could be causing this issue. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [November 17, 2021, 9:40pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-during-messagearrived/53211/2 "2021-11-17T21:40:59Z")
Can you get a Wireshark capture to go along with this? ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [November 17, 2021, 9:45pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-during-messagearrived/53211/3 "2021-11-17T21:45:59Z")
I’d still like to see a capture, but assuming this response buffer is accurate: ```auto 02 9c 00 00 00 05 00 01 03 00 31 ``` then your device response is short one byte. ---
**Author:** ![Daniel\_Morano](https://avatars.discourse-cdn.com/v4/letter/d/f475e1/32.png) [@Daniel\_Morano](https://forum.inductiveautomation.com/u/Daniel_Morano)\ **Post date:** [November 17, 2021, 10:04pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-during-messagearrived/53211/4 "2021-11-17T22:04:12Z")
Yes, this is what we thought, but were not entirely sure. We took another look at our device and found an issue with it that not designating the correct packet length.