When I open up Unity 5.3 and attempt to open Text101, I’m presented with an error message that pops up over the upgrade dialog box: “GetManagerFromContext: pointer to object of manager ‘MonoManager’ is NULL (table index 5)”
I’m not really sure how to work around this. Should I try a newer version of Unity, even though the instructor is using Unity 5.3?
Haven’t seen this one before, but it looks like quite a few other people have experienced it and it has been reported to Unity;
https://forum.unity3d.com/threads/5-5-1f1-editor-crashing.455608/
I’m not familiar with Mac but I’m guessing it has some kind of Application Error Log like Windows does? If so, you could have a look in there, probably best to make it repeat the problem and then the error should be near the top, if it logs one, it may shed some light.
You could upgrade, although it doesn’t appear to be version specific from what I can see, but maybe an uninstall / reinstall would help clear a blockage so to speak.
Does it occur if you create a new project in that version, or only when you try to open an older version? Assuming not, what happens if you create a new dummy project, then, close / open the older project? Same issue, or does the conversion happen without error?
Might be worth checking from a clean boot also, I’ve had some instances where things have apparently closed but have left “bits” running in the background which have then caused other things to not work.
Also, I note that the path to your project is in a DropBox folder, is DropBox running? Could there be any conflicts over access to files? You could always try copying the project out of that location and placing it elsewhere (desktop temporarily) and see if you can open it successfully from there.
Some suggestions and things to try if nothing else.