# Custom Expression Function not recognized "Unknown Function"

**URL:** <https://forum.inductiveautomation.com/t/custom-expression-function-not-recognized-unknown-function/91206>\
**Category:** Module Development\
**Created:** [May 31, 2024, 3:49pm UTC](https://forum.inductiveautomation.com/t/custom-expression-function-not-recognized-unknown-function/91206 "2024-05-31T15:49:42Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [May 31, 2024, 4:05pm UTC](https://forum.inductiveautomation.com/t/custom-expression-function-not-recognized-unknown-function/91206/4 "2024-05-31T16:05:30Z")

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Interesting. I had a report here in the forum about my Integration Toolkit functions not working for expression tags but everywhere else. That reporter fixed it by restarting their gateway and I never reproduced it.

Bug in the tag provider hierarchy, perhaps?

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