B4 TreeView buttons not working. What's wrong?

Question

css

Not much time to analyze all these details, but everything seems to be written correctly. But the tree buttons don't work. Those. Subcategories not opening. Or maybe I spelled them wrong. Point out the error.

$(function(){
var mytree = [
{
text: "All categories",
nodes: [
{
text: "Specialist appointment",
nodes: [
{
text: "..."
},
{
text: "..."
}
]
},
{
text: "ultrasound"
}
]
},

];

$('#tree').treeview({
data: mytree,
selectedicon: 'glyphicon glyphicon-stop',
backColor: '#eaeaea',
showBorder: false,
});
});