error CS1061: 'ReorderableList' does not contain a definition for 'IsSelected' and no accessible extension method 'IsSelected' accepting a .....

[Hamza272382]

I'm experiences the same issue after importing unity 2d extras, my unity version is 2019.4.40f1 LTS.

After installing git and adding its path to the environment variables I'm try to import the package through package manager using link

(https://github.com/Unity-Technologies/2d-extras.git#1.5.0-preview) but its not working and my mainfest.json file under packages folder also missing

what should i do???

[ChuanXin-Unity]

Hi,

You can create your own package file: Packages/manifest.json as shown below. Alternatively, you can download the 2019.4 branch from this repository and add it to Packages/com.unity.2d.tilemap.extras in your project.

{ "dependencies": { "com.unity.2d.sprite": "1.0.0", "com.unity.2d.tilemap": "1.0.0", "com.unity.2d.tilemap.extras": "https://github.com/Unity-Technologies/2d-extras.git#2019.4", "com.unity.ads": "2.3.1", "com.unity.analytics": "3.3.2", "com.unity.collab-proxy": "1.2.16", "com.unity.ide.rider": "1.0.8", "com.unity.ide.visualstudio": "1.0.11", "com.unity.ide.vscode": "1.0.7", "com.unity.multiplayer-hlapi": "1.0.4", "com.unity.purchasing": "2.0.6", "com.unity.textmeshpro": "2.0.1", "com.unity.timeline": "1.1.0", "com.unity.xr.legacyinputhelpers": "2.0.4", "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" } }

[plumpyfrog]

I solve this problem very easy on 2019.4.40f1 LTS.
You just need to delete this folder with package and rollback stable version without this error.
After klick on the plus sign in package manager and choose "Add package from git URL" and use this link:
https://github.com/Unity-Technologies/2d-extras.git#2019.4