Oh, sorry, my fault, @ MichelDiz is right, I forgot the type…
I add the type with other node, not this node, I can delete the node with a type now.Thanks all of you to reply. 
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Oh, sorry, my fault, @ MichelDiz is right, I forgot the type…
I add the type with other node, not this node, I can delete the node with a type now.Thanks all of you to reply. 