# UDT instances are not working - Ignition 8.0.12

**URL:** <https://forum.inductiveautomation.com/t/udt-instances-are-not-working-ignition-8-0-12/38029>\
**Category:** Ignition\
**Tags:** ignition80\
**Created:** [August 24, 2020, 6:16pm UTC](https://forum.inductiveautomation.com/t/udt-instances-are-not-working-ignition-8-0-12/38029 "2020-08-24T18:16:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![kade.castille](https://avatars.discourse-cdn.com/v4/letter/k/f05b48/32.png) [@kade.castille](https://forum.inductiveautomation.com/u/kade.castille)\
**Post date:** [August 24, 2020, 6:16pm UTC](https://forum.inductiveautomation.com/t/udt-instances-are-not-working-ignition-8-0-12/38029/1 "2020-08-24T18:16:05Z")

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Hello,

I am using Kepware to establish an OPC-UA connection to Ignition. The connection is valid, and standard opc tags brought over via the OPC browser work fine. However when trying to implement these tags within a UDT they aren’t working. I noticed that every time I create an instance of my UDT, I get an error when opening the instance “Structure contains invalid parent data types”. This is likely the issue here, but I can’t think of what would be causing this.

Any advice would be appreciated, thanks!

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<div class="post-metadata">

**Author:** ![kade.castille](https://avatars.discourse-cdn.com/v4/letter/k/f05b48/32.png) [@kade.castille](https://forum.inductiveautomation.com/u/kade.castille)\
**Post date:** [August 24, 2020, 6:19pm UTC](https://forum.inductiveautomation.com/t/udt-instances-are-not-working-ignition-8-0-12/38029/2 "2020-08-24T18:19:33Z")

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Upon further research, this appears to be a bug that has also shown up in earlier versions of Ignition 8.0. Should I consider changing to a different version? Look forward to hearing back from someone, thanks.