Multiple Precompiled Assemblies With the Same Name

Unity Engine
1

I’m getting an error after I imported a package to Unity,

Multiple precompiled assemblies with the same name Newtonsoft.Json.dll included or the current platform. Only one assembly with the same name is allowed per platform. (Assets/Plugins/Newtonsoft Json/Runtime/AOT/Newtonsoft.Json.dll)

I looked around for a solution, and people were saying it had to do with Unity Ads(which I don’t have) and another solution I found was to delete one of the Newtonsoft.Json.dll files, which, if I delete either or the app fails to build. I don’t even know how to get rid of the package that’s caused it, nor do I really want to, the issue started after I imported this package,

Is there any way to fix this?

Thanks.

Edit: The duplicate(that came with the above Unity package) seems to be coming from D:/VR-Chat/Library/PackageCache/com.unity.nuget.newtonsoft-json@2.0.0/Runtime/Newtonsoft.Json.dll)

I tried deleting this one as well, the whole package, just to see what would happen. It automatically reimports it.

1 Like
2

Sorry, can anyone help with this, please?

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3

Bump

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4

As the error says, you have one too many. You need to remove one. Probably you should contact the readyplayer owners and inform them that including this 3rd-party package is in collision with other packages.

If I’m understanding you correctly, the readyplayer is an asset. If it’s true, you just need to remove the dll (Assets/Plugins/Newtonsoft Json/Runtime/AOT/Newtonsoft.Json.dll) from that.
Please use caution, backup your project before you delete anything and/or use your version control system!

All in all, the goal is to have only one file per target platform.

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I tried backing up this file and deleting it, in both packages. Either one causes an error that prevents building, i was able to build just fine before installing this asset…

Yeah sorry, it’s a unity package.

6

Can someone please help with this? I had to remove the package, I have no idea how to get it working. My client would really like to use this package.

7

I’m having the same issue

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https://forum.unity.com/threads/unity-package-manager-error.1144484/#post-7351460
I didn’t realize I had posted this question twice, but here’s the link to my other post, MaskedMouse helped me solve it. Hope it helps you.

PS, Kinda rude to just be like “I’m having the same issue” lol

1 Like
9

Please help me how to resolve this problem,
Multiple precompiled assemblies with the same name Newtonsoft.Json.dll included or the current platform. Only one assembly with the same name is allowed per platform. (C:/Users/GAMEPLAY/Desktop/Train In Jungle/Library/PackageCache/com.unity.nuget.newtonsoft-json@2.0.0/Runtime/Newtonsoft.Json.dll)

10

hi there, i dont know if this solution will help you but it helped me, i rename one of the dlls that was causing me problems in one of the paths, something such as Newtonsoft_old.Json.dll

so unity only took 1 dll, hope it helps.

11

No it’s not mate, he’s just saying that he too is facing the same problem. It’s validation that the problem steps beyond just you that’s facing it…

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It’s rude in my opinion to hijack a thread over a month after it was posted and say “I’m having the same problem” without any further explanation, like look at the next guy’s question, at least he asked nicely. Btw, why necro my post from 4 months ago just to call me out for calling the guy rude? XD

13

> eh. it’s the unity forums - time is a flat circle here.

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Multiple precompiled assemblies with the same name Newtonsoft.Json.dll included on the current platform. Only one assembly with the same name is allowed per platform. (Assets/UnityPackages/JsonNet/Newtonsoft.Json.dll)

On quixel Unity plugin, any help?

15

I believe Newtonsoft.json.dll is now included in Unity, like version 2020.3.24f1 LTS, it’s broken a lot of peoples projects due to already being present. So much for the “LTS” logo meaning :slight_smile:

More on this here: [Newtonsoft Json package | Page 2 - Unity Forum]( Newtonsoft Json package page-2)

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16

Hello i have the same problem, i tried deleting the Newton package but it keeps coming back by itself and keeps giving the same error message and i have to go into safemode.

17

I’m having the same issue

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18

You can do it, bro. I believe in you.

19

Well in project there was another file in the “Plugin” folder I deleted that Newtonsoft.json.dll file and the error disappeared.

Hope it’ll solve this issue for you.

20

Yes, you need to delete the two extra Newtonsoft dlls.

1 Like