"Failed To Resolve Packages: The File packages\manifest.json is not valid jason"

Unity Engine
,
1

When I attempt to open my project with unity editor version 2021.3.4f1, I receive the following error message;
8695284--1173366--upload_2022-12-30_23-5-31.png
Where to go from here? Using reimport all from the asset menu does not work.

2

did you manually edit the manifest.json?
maybe attach it here so someone can point out the issue

3

I do not believe I manually edited this file, but here is the file text (I was not allowed JSON as an attachment).:

{
  "dependencies": {
    "com.unity.2d.sprite": "1.0.0",
    "com.unity.2d.tilemap": "1.0.0",
    "com.unity.ads": "3.7.5",
    "com.unity.analytics": "3.6.11",
    "com.unity.collab-proxy": "1.15.15",
    "com.unity.collab-proxy": "1.9.0",
    "com.unity.collab-proxy": "1.14.15",
    "com.unity.ext.nunit": "1.0.6",
    "com.unity.ide.rider": "2.0.7",
    "com.unity.ide.visualstudio": "2.0.11",
    "com.unity.ide.vscode": "1.2.3",
    "com.unity.purchasing": "3.2.2",
    "com.unity.test-framework": "1.1.29",
    "com.unity.textmeshpro": "3.0.6",
    "com.unity.timeline": "1.4.8",
    "com.unity.ugui": "1.0.0",
    "com.unity.modules.ai": "1.0.0",
    "com.unity.modules.androidjni": "1.0.0",
    "com.unity.modules.animation": "1.0.0",
    "com.unity.modules.assetbundle": "1.0.0",
    "com.unity.modules.audio": "1.0.0",
    "com.unity.modules.cloth": "1.0.0",
    "com.unity.modules.director": "1.0.0",
    "com.unity.modules.imageconversion": "1.0.0",
    "com.unity.modules.imgui": "1.0.0",
    "com.unity.modules.jsonserialize": "1.0.0",
    "com.unity.modules.particlesystem": "1.0.0",
    "com.unity.modules.physics": "1.0.0",
    "com.unity.modules.physics2d": "1.0.0",
    "com.unity.modules.screencapture": "1.0.0",
    "com.unity.modules.terrain": "1.0.0",
    "com.unity.modules.terrainphysics": "1.0.0",
    "com.unity.modules.tilemap": "1.0.0",
    "com.unity.modules.ui": "1.0.0",
    "com.unity.modules.uielements": "1.0.0",
    "com.unity.modules.umbra": "1.0.0",
    "com.unity.modules.unityanalytics": "1.0.0",
    "com.unity.modules.unitywebrequest": "1.0.0",
    "com.unity.modules.unitywebrequestassetbundle": "1.0.0",
    "com.unity.modules.unitywebrequestaudio": "1.0.0",
    "com.unity.modules.unitywebrequesttexture": "1.0.0",
    "com.unity.modules.unitywebrequestwww": "1.0.0",
    "com.unity.modules.vehicles": "1.0.0",
    "com.unity.modules.video": "1.0.0",
    "com.unity.modules.vr": "1.0.0",
    "com.unity.modules.wind": "1.0.0",
    "com.unity.modules.xr": "1.0.0"
  }
}
4 
    "com.unity.collab-proxy": "1.15.15",
    "com.unity.collab-proxy": "1.9.0",
    "com.unity.collab-proxy": "1.14.15",

this package is listed three times for some reason
try removing the latter two lines and then reopen the project

5

I receive the same error message

6

As CodeSmile pointed out the package com.unity.collab-proxy is listed 3 times, and it should only be present once. I’m not sure how this happened. Did you manually removed as suggested from your manifest.json

"com.unity.collab-proxy": "1.9.0",
"com.unity.collab-proxy": "1.14.15",

and reopned Unity, and still have the same issue, having the three occurrences of com.unity.collab-proxy?