Shader Graph doesn't compile in existing project 2019.3

Unity Engine
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1

Hey everyone,

I’m trying to update an existing project to 2019.3 with URP to get the benefits of the new SRP batcher. When I imported the URP package it doesn’t compile, throwing 31 errors that cannot be cleared from the console. The errors were coming from the Shader Graph package, so I removed URP and installed just the Shader Graph package and got the exact same results. I tried the same thing in an empty project and it worked fine.

I’ve tried both 7.1.8 and 7.2, I’m using Unity 2019.3.0f6 and yes, I’m using .NET 4. I am set to Android as the build target, not sure if that has anything do with it. I don’t really want to switch to PC to find out because it’ll be close to a 24 hour import (very large project).

Here’s a sample of the first few errors in the list:

Library\PackageCache\com.unity.shadergraph@7.1.8\Editor\Drawing\Views\GraphEditorView.cs(282,45): error CS0030: Cannot convert type 'System.Action<Group, string>' to 'Group'

Library\PackageCache\com.unity.shadergraph@7.1.8\Editor\Drawing\Views\GraphEditorView.cs(282,45): error CS0266: Cannot implicitly convert type 'System.Action<Group, string>' to 'System.Action<UnityEditor.Experimental.GraphView.Group, string>'. An explicit conversion exists (are you missing a cast?)

Library\PackageCache\com.unity.shadergraph@7.1.8\Editor\Drawing\Views\GraphEditorView.cs(283,48): error CS0266: Cannot implicitly convert type 'System.Action<Group, System.Collections.Generic.IEnumerable<UnityEditor.Experimental.GraphView.GraphElement>>' to 'System.Action<UnityEditor.Experimental.GraphView.Group, System.Collections.Generic.IEnumerable<UnityEditor.Experimental.GraphView.GraphElement>>'. An explicit conversion exists (are you missing a cast?)

Library\PackageCache\com.unity.shadergraph@7.1.8\Editor\Drawing\Views\GraphEditorView.cs(355,37): error CS0039: Cannot convert type 'UnityEditor.Experimental.GraphView.GraphElement' to 'UnityEditor.ShaderGraph.ShaderGroup' via a reference conversion, boxing conversion, unboxing conversion, wrapping conversion, or null type conversion

Library\PackageCache\com.unity.shadergraph@7.1.8\Editor\Drawing\Views\GraphEditorView.cs(359,69): error CS1061: 'ShaderGroup' does not contain a definition for 'containedElements' and no accessible extension method 'containedElements' accepting a first argument of type 'ShaderGroup' could be found (are you missing a using directive or an assembly reference?)

At this point we’re blocked from updating.

2

Update: I regenerated my Library folder overnight and it’s still the same story.

3

Fixed: (Not that I like the fix… but it worked).

I went to all the places the error was occurring (modifying the Unity package) and changed “Group” to “UnityEditor.Experimental.GraphView.Group”. There was clearly a conflict, but no matter how hard I tried to find what it was conflicting with, I couldn’t. It will forever be shrouded in mystery.