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java.lang.IllegalArgumentException: host parameter is null	at org.apache.commons.httpclient.HttpConnection.(HttpConnection.java:206)	at org.apache.commons.httpclient.HttpConnection.(HttpConnection.java:155)	at org.apache.commons.httpclient.SimpleHttpConnectionManager.getConnectionWithTimeout(SimpleHttpConnectionManager.java:175)	at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:153)	at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)	at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)	at org.gftp.FlickrDownload.IOUtils.getRemoteFilename(IOUtils.java:99)	at org.gftp.FlickrDownload.IOUtils.getVideoExtension(IOUtils.java:111)	at org.gftp.FlickrDownload.AbstractSet.processPhoto(AbstractSet.java:136)	at org.gftp.FlickrDownload.Set.download(Set.java:49)	at org.gftp.FlickrDownload.AbstractSet.createSetlevelXml(AbstractSet.java:239)	at org.gftp.FlickrDownload.Sets.downloadAllPhotos(Sets.java:109)	at org.gftp.FlickrDownload.FlickrDownload.main(FlickrDownload.java:229)