Unity 2020.1.0f1 (IL2CPP error for method 'System.Void) error - unity3d

Just formatted my Mac and put a clean install of Catalina on and, then updated Unity to 2020.1.0f1 loaded my project that's been working fine on Catalina before reinstalling and updating Unity, but now when I try and build I get this error.
IL2CPP error for method 'System.Void Unity.GeneratedNetworkCode::_WriteArrayVector3_None(UnityEngine.Networking.NetworkWriter,UnityEngine.Vector3[])' in assembly '/Users/kevin/Desktop/AR_Army_New/Temp/StagingArea/Data/Managed/Assembly-CSharp.dll' Additional information: Hash code collision on value 09716D6B6B7159FFA4DDC4AAF2722973A3FF4FC8
Anyone know what's gong on please ?

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I recently had this problem on Android. I updated to the latest developer build of MonoGame and that sorted out the issue. Also, to prevent the initial crash I used try{} catch{} on each of my sound file imports to prevent the game from crashing.

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Library\PackageCache\com.unity.textmeshpro#2.0.0\Scripts\Editor\TMP_PackageUtilities.cs(310,17): error CS0433: The type 'Task' exists in both 'System.Threading, Version=1.0.3333.0, Culture=neutral, PublicKeyToken=402899b480e6f383' and 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
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SOLUTION:
Thank you for your answers, I have found solution on other forum.
The way to fix the error in unity 2019.1.0f2
Go to Window->Package Manager
TextMesh Pro (Version 2.0.0 will be installed)
Click on the arrow > on the left to see all the available versions.
4 .Update TextMesh Pro to 1.3.0 (same version as in Unity 2018.3.12f1)
Let the compiler finish and you should see the error clearing from the console
Link to original post: Original post
In Unity 2019.1.5 Looks like TextMeshPro needs at least .net ver 4, I changed .net from 3.5 to 4.6 by going: File > Build Settings > Player Settings > Player > Scripting Runtime Version (which also has a warning on 3.5), selecting 4.6, after reload, textMesh error gone ... moving onto all the other errors in my project!

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I cannot build any macOS Swift projects with it.
If I create a new Cocoa application Xcode project and set it to use Swift, when I try to compile it, I immediately get the following error in the "check dependencies" phase:
error: There is no SDK with the name or path '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk'
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I can build Swift projects that targeting other platforms like iOS. Just not macOS.
Help!
try running this command then reopening the project
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look at this pic
saw it here yesterday

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Here is a screen shot:
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thanks in advance!!!