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java.lang.IllegalArgumentException: URI can't be null.	at sun.net.spi.DefaultProxySelector.select(DefaultProxySelector.java:116)	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:906)	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:836)	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1014)	at com.diablominer.DiabloMiner.NetworkState.JSONRPCNetworkState.doJSONRPCCall(JSONRPCNetworkState.java:108)	at com.diablominer.DiabloMiner.NetworkState.JSONRPCNetworkState.doGetWorkMessage(JSONRPCNetworkState.java:329)	at com.diablominer.DiabloMiner.NetworkState.JSONRPCNetworkState$GetWorkAsync.run(JSONRPCNetworkState.java:427)	at java.lang.Thread.run(Thread.java:680)