[Error] Unity 2017.4.31f1 - 'UnityEditor.EditorApplication.add_hierarchyChanged' not found

Benbabwe

New member
When importing Behavior Designer to my project, I am getting some errors that prevent Behavior trees from working properly. Here is what the errors look like in the console:

1626206436840.png

When I initially imported the asset, there were lot more errors, but fixed them by updating the scripting runtime version to 4.6 (from 3.5). Now there are only these two errors, and even if I re-import, I just get these two errors. If I try to interact with the Behavior Designer at all, I get TypeLoadExceptions and more MissingMethodExceptions such as these:

1626206722413.png

Any ideas on how to fix this?
 
Unity 2017 is no longer supported. The minimum that we now support is 2019.4.
 
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