RemoveVertex is not working in flink Gelly.

[RAMALINGESWARA RAO THOTTEMPUDI]

Respected Sir,

This is my code of flink gelly:

for(Vertex<String, NullValue> vertex : node_set) {
System.out.println(vertex);
graph_copy.removeVertevertex);
temp.add(vertex);
}

For some reason "removeVertex" is not working even on giving correct parameters.
Kindly resolve the issue. Given a list of edges, remove vertices with some degree "i" recursively.