Exception Thrown: java.util.NoSuchElementException: Key not in table
java.util.NoSuchElementException: Key not in table
	at HashtableMap.get(HashtableMap.java:136)
	at BaseGraph.insertEdge(BaseGraph.java:131)
	at Backend.loadGraphData(Backend.java:72)
	at WebApp.createWorkingFrontend(WebApp.java:116)
	at WebApp.handleSingleResponse(WebApp.java:175)
	at WebApp.main(WebApp.java:47)