Strange ClassCastException error

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0

Ok, the code I work with is just a simple project, but it contains many folders and there's no point in posting it here.

Anyways, when I run my code, everything is fine, then if I run my code again, i get. at

list.DList.findVertexNode(DList.java:161)
    at dict.VertexHash.insert(VertexHash.java:35)
    at graph.WUGraph.addVertex(WUGraph.java:92)
    at KruskalTest.main(KruskalTest.java:122)

huh? I mean i didn't even change one bit of my code, and sometimes I get an error and sometimes I don't?

edited 9 secs ago

Abimaran Kugathasan

9,762

asked 58 secs ago

user3525283

1