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java.lang.IllegalArgumentException: Must supply a valid URL	at org.jsoup.helper.Validate.notEmpty(Validate.java:102)	at org.jsoup.helper.HttpConnection.url(HttpConnection.java:72)	at org.jsoup.helper.HttpConnection.connect(HttpConnection.java:36)	at org.jsoup.Jsoup.connect(Jsoup.java:73)	at pl.dariusz.app.imgDownloader.doInBackground(imgDownloader.java:30)	at pl.dariusz.app.imgDownloader.doInBackground(imgDownloader.java:12)	at android.os.AsyncTask$2.call(AsyncTask.java:295)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)