MissingMethodException for UnityEditor.VersionControl.Provider.Checkout in built dll Unity 2019.1.2f

I have the following code that is used to check if an asset is in source control (Debug.Logs added to try and figure out what's going on):

Code (CSharp):

1.    // returns false if path is not in source control or source control is not active
2.    // optionally, you can check out the file if it is in source control (default behavior is to check out)
3.    public static bool IsFileInSourceControl(string path, bool checkout = true)
4.    {
5.       bool inVC = false;
6.  
7.       // blocking checkout of versioned file, if necessary
8.       Debug.Log("30");
9.       if (UnityEditor.VersionControl.Provider.isActive)
10.       {
11.       Debug.Log("31");
12.          UnityEditor.VersionControl.Asset asset = UnityEditor.VersionControl.Provider.GetAssetByPath(path.RelativeAssetPath());
13.       Debug.Log("32");
14.          if (asset != null)
15.          {
16.       Debug.Log("33");
17.             UnityEditor.VersionControl.Task statusTask = UnityEditor.VersionControl.Provider.Status(asset);
18.       Debug.Log("34");
19.             statusTask.Wait();
20.       Debug.Log("35");
21.             if (UnityEditor.VersionControl.Provider.CheckoutIsValid(statusTask.assetList[0]))
22.             {
23.       Debug.Log("36");
24.                inVC = true;
25.       Debug.Log("37");
26.                if (checkout)
27.                {
28.       Debug.Log("38");
29.                   UnityEditor.VersionControl.Task coTask = UnityEditor.VersionControl.Provider.Checkout(statusTask.assetList[0], UnityEditor.VersionControl.CheckoutMode.Both);
30.       Debug.Log("39");
31.                   coTask.Wait();
32.       Debug.Log("40");
33.                }
34.             }
35.          }
36.       }
37.  
38.       Debug.Log("41");
39.       return inVC;
40.    }

If this code gets executed as loose files in my development project, everything is fine. It fails the first if statement and returns false because I do not have version control support enabled. If I run it when the plugin (uScript) is built into dll form, the function throws a MissingMethodException when immediately entering the function (or at least before the Debug.Log("30"); line because that is not printed out). Upon logging the exception in my exception handler with the following line:

Debug.Log(e.GetType().ToString() + ": " + e.Message + ": " + e.StackTrace);

I get the following:

Code (CSharp):

1. System.MissingMethodException: UnityEditor.VersionControl.Task UnityEditor.VersionControl.Provider.Checkout(UnityEditor.VersionControl.Asset,UnityEditor.VersionControl.CheckoutMode):   at Detox.ScriptEditor.ScriptEditor.SaveTextFile (System.String path, System.String fileContents) [0x0000c] in <55f14d46cc544231bdbe6d4f9e4abdba>:0
2. UnityEngine.Debug:Log(Object)
3. Detox.ScriptEditor.ScriptEditor:SaveTextFile(String, String)
4. Detox.ScriptEditor.ScriptEditor:Save(String, String, String, Boolean, Boolean, Boolean)
5. uScript:SaveGraph(ScriptEditor, String, Boolean, Boolean, Boolean, Boolean)
6. uScript:SaveGraph(Boolean, Boolean, Boolean, Boolean)
7. uScript:RequestSave(Boolean, Boolean, Boolean, Boolean)
8. Detox.Editor.GUI.PanelScriptCurrent:DrawToolbarButtons()
9. Detox.Editor.GUI.PanelScriptCurrent:DrawToolbar(PanelScript)
10. Detox.Editor.GUI.PanelScriptCurrent:Draw(PanelScript)
11. Detox.Editor.GUI.PanelScript:Draw()
12. uScript:DrawGUIBottomAreas()
13. uScript:DrawMainGUI()
14. uScript:OnGUI()
15. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Anyone know what gives? This code has been tested in previous Unity versions up through at least 2018.2.0f2 and this does not happen.

 

I too have this problem. I thought that they might have changed the API but I can't see an issue.