Did you open the TreeBuilder.html in your browser to create the tree ?

Tree Builder App/Tree Builder App/TreeBuilder.html

If you have any menu plugins put it under that i had the same problem

Oh if your doin it in the tester you need to copy the same file and rename it Test_Techtrees.json

Edit: Not sure if i should do this but i apologise in advance FELSKI

The help notes from MV maybe this should help

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Notetags

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You can add a tree to an actor by adding the uids of the trees via notetags:

<techtree>

HOLY

HEALER

</techtree>

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Plugin Commands

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You can directly open the skill tree scene.

- TECHTREE [actorId]

You can prepare the scene using the following commands:

- TECHTREE DISPLAYONLY

opens the tree in display only mode, similar to the new plugin parameter

- TECHTREE PRESELECT [tree uid]

preselects a specific tree for the actor. If the tree isnt found, the default selection is used.

- TECHTREE SINGLE

prevents the user from changing trees

You can reset all techtrees for an actor.

- RESETTECHTREES [actorId] [refund]

You can reset a specific techtree for an actor by uid. Put in true or false for [refund].

- RESETTECHTREE [actorId] [tree uid] [refund]

You can save the amount of active nodes in a tree by uid in a variable. Put in true or false for [refund].

- ACTIVENODES [actorId] [tree uid] [variable Id]

You can add a techtree during the game:

- ADDTECHTREE [actorId] [tree uid]

You can activate a specific node during the game for an actor using:

- ACTIVATENODE [actorId] [tree uid] [node uid]

You can deactivate a specific node during the game for an actor using (the usually unlearn settings will be applied):

- DEACTIVATENODE [actorId] [tree uid] [node uid]