# Procedural Walk Animation in UE5 causing strange Error

**URL:** <https://forums.unrealengine.com/t/procedural-walk-animation-in-ue5-causing-strange-error/823958>\
**Category:** Blueprint\
**Tags:** walk, unreal-engine, procedural, Blueprint\
**Created:** [March 26, 2023, 7:03am UTC](https://forums.unrealengine.com/t/procedural-walk-animation-in-ue5-causing-strange-error/823958 "2023-03-26T07:03:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![MattLikens](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@MattLikens](https://forums.unrealengine.com/u/MattLikens)\
**Post date:** [March 26, 2023, 7:03am UTC](https://forums.unrealengine.com/t/procedural-walk-animation-in-ue5-causing-strange-error/823958/1 "2023-03-26T07:03:50Z")

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I am attempting to implement a procedural walk animation in UE5, similar to the one demonstrated in this video: **Full Body IK: Procedural Dragon Animations** [https://www.youtube.com/watch?v=Z8eqaFG7lZQ](https://www.youtube.com/watch?v=Z8eqaFG7lZQ). The video by Andreas Suika borrows heavily from the PowerIK demo project. I believe Power IK has been integrated into Unreal Engine as Full Body IK.

The PowerIK plugin is available for 4.25 and 4.26. A demo project is still available here ([https://www.dropbox.com/s/jx91ql3e5wp0s4f/PowerIKDemoProject.zip?dl=0](https://www.dropbox.com/s/jx91ql3e5wp0s4f/PowerIKDemoProject.zip?dl=0)). This filled in a lot of the things Suika glossed over.

Suika’s approach is implemented in UE5 and adds a control rig and other post-animation blueprint enhancements.

When I try to replicate Suika’s methodology in my UE5 project, I encounter an “Accessed None trying to read property…” error when trying to read the Foot Positions from the BP\_Legs in my Blueprint Character, even though it should be set in the “Event Blueprint Begin Play”. Some elements in the video are not thoroughly explained, so I might be missing something that causes this issue, but I suspect not. I did a lot of checking with “Print String” nodes to try and deduce what is happening, but I still can’t figure it out. The legs seem to be valid when set, but not when querying for “Foot Position.”

Could someone provide assistance or suggest a path to investigate this issue?

 ![AnimBlueprint](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/1/d/21d31ea8398d2e5b013bfb8e55eb559656dc3401.jpeg)

 ![Errors](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/b/9/3b9cd06f4472d931b6c82bb57f240df06cd5bdfc.png)

 ![BPChar_LegManager copy](https://d3kjluh73b9h9o.cloudfront.net/original/4X/d/8/5/d85dbe6718fde00187b43298eacc49223b0f979b.jpeg)

 ![BP_Leg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/f/b/7fbd1dacf3ce654cbb0e1cc5653893087bd3a1ff.jpeg)

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<div class="post-metadata">

**Author:** ![MattLikens](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@MattLikens](https://forums.unrealengine.com/u/MattLikens)\
**Post date:** [March 26, 2023, 7:14am UTC](https://forums.unrealengine.com/t/procedural-walk-animation-in-ue5-causing-strange-error/823958/2 "2023-03-26T07:14:17Z")

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Higher res images can be found here:

[https://drive.google.com/drive/folders/1j1IGn8ek1ylwjWjtG3YuoYTdWK2zAKK4?usp=share\_link](https://drive.google.com/drive/folders/1j1IGn8ek1ylwjWjtG3YuoYTdWK2zAKK4?usp=share_link)

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**Author:** ![Monster\_Games](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Monster\_Games](https://forums.unrealengine.com/u/Monster_Games)\
**Post date:** [November 8, 2023, 3:14pm UTC](https://forums.unrealengine.com/t/procedural-walk-animation-in-ue5-causing-strange-error/823958/3 "2023-11-08T15:14:38Z")

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it may be because you didn’t add the tag in the details panel of the scene component (FRLeg tag for BP\_FRLeg scene component and FLLeg tag for BP\_FLLeg scene component) in your character’s blueprint (BP\_Spider)