java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.android.okhttp.internal.http.HttpTransport.readResponseHeaders(HttpTransport.java:136)
at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:644)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:347)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:296)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:503)
at com.vk.sdk.api.httpClient.VKHttpClient$VKHttpResponse.(VKHttpClient.java:337)
at com.vk.sdk.api.httpClient.VKHttpClient.execute(VKHttpClient.java:167)
at com.vk.sdk.api.httpClient.VKHttpOperation.start(VKHttpOperation.java:77)
at com.vk.sdk.api.httpClient.VKHttpClient$2.run(VKHttpClient.java:147)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)

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