Java exception occurred: java.lang.​IllegalSta​teExceptio​n: node does not allow children

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Grace Shaib
Grace Shaib el 12 de Feb. de 2019
Hello,
I am trying to create a node tree. In the script, I created the root of the tree and added several nodes to it. However when I use the recursive function: this function will create more nodes for the tree itself, I am receiving this error
Java exception occurred:
java.lang.IllegalStateException: node does not allow children
at javax.swing.tree.DefaultMutableTreeNode.insert(DefaultMutableTreeNode.java:175)
at javax.swing.tree.DefaultMutableTreeNode.add(DefaultMutableTreeNode.java:411)
Does anyone know what it means?

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