android.os.NetworkOnMainThreadException: This exception has no message.

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This exception has no message.
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This exception has no message.
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This exception has no message.
android.os.NetworkOnMainThreadException:
at com.android.okhttp.okio.Okio$1.write(Okio.java:76)
at com.android.okhttp.okio.AsyncTimeout$1.write(AsyncTimeout.java:155)
at com.android.okhttp.okio.RealBufferedSink.flush(RealBufferedSink.java:221)
at com.android.okhttp.internal.http.HttpConnection.flush(HttpConnection.java:141)
at com.android.okhttp.internal.http.HttpTransport.finishRequest(HttpTransport.java:52)
at com.android.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:902)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:443)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:388)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:231)
at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:210)
at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java)
at com.android.backgroundchooser.Main2Activity.getBitmapFromURL(Main2Activity.java:60)
at com.android.backgroundchooser.Main2Activity$1.onClick(Main2Activity.java:42)
at android.view.View.performClick(View.java:5204)
at android.view.View$PerformClick.run(View.java:21156)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5466)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

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