# Library loaded but get Specialization patch not found

**URL:** <https://forum.xod.io/t/library-loaded-but-get-specialization-patch-not-found/7168>\
**Category:** XOD Programming Questions\
**Created:** [July 24, 2025, 12:54pm UTC](https://forum.xod.io/t/library-loaded-but-get-specialization-patch-not-found/7168 "2025-07-24T12:54:35Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![lnorwood](https://avatars.discourse-cdn.com/v4/letter/l/dfb087/32.png) [@lnorwood](https://forum.xod.io/u/lnorwood)\
**Post date:** [July 24, 2025, 12:54pm UTC](https://forum.xod.io/t/library-loaded-but-get-specialization-patch-not-found/7168/1 "2025-07-24T12:54:35Z")

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I am trying to use the bacic functions “Gate” and [xod/core](https://xod.io/libs/xod/core)/pulse-on-change. I have the xod/core@0.37.3 loaded and I get the error Specialization patch not found  
Cannot find specialization gate(port) for abstract xod/core/gate.  
Try creating the missing patch in your project or install a library which provides such one.

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**Author:** ![gweimer](https://avatars.discourse-cdn.com/v4/letter/g/a9adbd/32.png) [@gweimer](https://forum.xod.io/u/gweimer)\
**Post date:** [July 24, 2025, 1:10pm UTC](https://forum.xod.io/t/library-loaded-but-get-specialization-patch-not-found/7168/2 "2025-07-24T13:10:14Z")

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Why are you trying to use ‘gate’ to block port #? Seems like an odd thing to be trying to do. If you really do need to do it, you can take a look at gate(number) (or any other gate(\<data\_type\>) that exists) to see how it is coded & make a copy that does the same thing for port

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**Author:** ![lnorwood](https://avatars.discourse-cdn.com/v4/letter/l/dfb087/32.png) [@lnorwood](https://forum.xod.io/u/lnorwood)\
**Post date:** [July 25, 2025, 10:36am UTC](https://forum.xod.io/t/library-loaded-but-get-specialization-patch-not-found/7168/3 "2025-07-25T10:36:22Z")

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I was tying to read the pin/port/ logic level of D10 and use it to trigger another function. I am a newbee so it may be the wrong function but still why am I getting the error  
Thanks!!!

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**Author:** ![gweimer](https://avatars.discourse-cdn.com/v4/letter/g/a9adbd/32.png) [@gweimer](https://forum.xod.io/u/gweimer)\
**Post date:** [July 25, 2025, 5:27pm UTC](https://forum.xod.io/t/library-loaded-but-get-specialization-patch-not-found/7168/4 "2025-07-25T17:27:02Z")

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‘gate’ is a generic patch that has sub-patches to handle different data types. No sub-patch is provided for port, probably because the developers figured it would never be needed.

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**Author:** ![gweimer](https://avatars.discourse-cdn.com/v4/letter/g/a9adbd/32.png) [@gweimer](https://forum.xod.io/u/gweimer)\
**Post date:** [July 25, 2025, 5:28pm UTC](https://forum.xod.io/t/library-loaded-but-get-specialization-patch-not-found/7168/5 "2025-07-25T17:28:33Z")

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The ‘gate’ patch is to block a signal under certain conditions. It seldom makes sense to change a port# in the middle of a program, much less use a gate for it.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex027/uploads/xod/original/1X/eb7348baa04192c2ef932d1db54d44f09f8a7888.png) [@system](https://forum.xod.io/u/system)\
**Post date:** [August 24, 2025, 5:29pm UTC](https://forum.xod.io/t/library-loaded-but-get-specialization-patch-not-found/7168/6 "2025-08-24T17:29:19Z")

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