java.lang.IllegalArgumentException: protocol = http host = null

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java.lang.IllegalArgumentException: protocol = http host = null
at sun.net.spi.DefaultProxySelector.select(DefaultProxySelector.java:176)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1099)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:999)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:933)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1513)
at com.sun.webkit.network.URLLoader.close(URLLoader.java:591)
at com.sun.webkit.network.URLLoader.doRun(URLLoader.java:173)
at com.sun.webkit.network.URLLoader.lambda$run$91(URLLoader.java:128)
at com.sun.webkit.network.URLLoader.run(URLLoader.java:127)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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