What have I done wrong this time 
A single package is in 3.0 packages…
But in Dynamo, it’s vanished (it was there earlier)…
However, an add-on called, “Revit” is there.
What’s going on?
Is there a pkg.json in that package folder?
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if it is yours , i think you struggle with .dll files. Can you build your stuff again in visual studio ?
And in the packages folder only the one package so far:
I made the few nodes in there this morning from scratch in Dynamo (not in VS).
I did Ctrl+Shift+N. Then filled out name and description and typed in Addon-Ons Category and clicked the Save button.
The Add-Ons Category had, "Revit, Revit.Steel Connections and Revit.Steel Connections.Filter options but I added a new one.
If I drag and drop a single node from my windows folder onto the Dynamo canvas the whole package then appears under my Add-ons.
I also notice the package paths only say 3.0 and not 3.0 packages?
oh… I just clicked what your question was getting at Jacob.
How do I restore/ create a JSON?
UPDATE… I think it was the missing JSON.
So I copied one from another package and opened in VS… Changed the data to suit and stuck it into the folder.
So far… so good. 
The easy way to generate the pkg.json is to publish a package locally; that will generate EVERYTHING you need without having to update anything in VS. This way you can add help files, extra content, and other such stuff too.
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