yea, best option is just to upload as many anims as you have ready and then wait 20min to an hour for them to show up in your user/group inventory before testing.
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Yeah I would agree thatās the best choice you have. Though Iām not having this problem anymore so is it just me or is anyone else not having this problem either?
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I keep having it. Just tried retesting all my animations and I still get it.
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My friend got it aswell, i have tried all the methods people have commented. Why havent roblox noticed this post yet? Must be an engine bug?
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I have gotten this error on my custom model on both group animations and my own animations, I am not sure what could be causing the error.
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Has this Issue been fix for anyone? because I am still experiencing the same thing where the animations fail to load. This is a major Issue for me as my game mostly depends on animations, for it to look good.
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Its not working for me either, I created an animation, published it to ROBLOX, loaded it from Humanoid.Animator, and played it as I get the same error. Roblox fix this!
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This error is now being apparent to all new uploaded animations as of now, i think it has to do with the roblox servers but animations that were uploaded before a few hours ago work fine, and animations that are valid before that time period work too. Critical errorā¦?
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I think, itās probably a critical error because some animations that I uploaded yesterday work fine but the ones I uploaded an 1 hour ago donāt.
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Exactly what i was saying, hopefully roblox fixes this because it could really affect developing games but im sure it is going to be temporarily.
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im having this problem too. i uploaded an animation twice and none of the two times either show up in my inventory or work in studio
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+1 to this, for me it wonāt even work in-game.
It still shows the animation in Toolbox but not backpack, and when I load it in the Web Browser, it shows as a valid asset, like everything else.
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Iāve been getting this same error.This has been an ongoing issue for over 2 months now and Iām really wondering when its going to be fixed
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looks like a Roblox server issue to meā¦ so the only possible fix is to wait.
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Hi guys! (I think I found the solution 
)
Iām sure the animations arenāt working because the animations youāre using havenāt been uploaded to your group game. If thatās the case, download them for your group game and the animation should work perfectly!
Have a nice day 
Pasla03
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your your solution is everyone is just stupid? bahahahahah
clearly you donāt understand the issue they are facing.
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If you put the animation instance somewhere in your game beforehand and donāt create it instantly from a script. it works perfectly fine.
Iāve been having this issue for weeks and putting the animations in replicatedStorage beforehand has fixed this error.
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I I recommend adding descriptions to the animations created so that the error does not appear. It has worked for me since I tried it. Any description, such as āajksdfjlkadsjlkf,ā will work, as long as it does not contain any obscene or objectionable messages according to the Roblox team. This method works for R6 animations; I havenāt tested it on R15, but I imagine it will work the same way
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doesnāt work with r15. weāre screwed 
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Got this issue aswell, tried everything but nothing.
Edit: This guy helped me, check his post: Failed to load animation - sanitized ID - #2 by TechyPlains
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