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java.lang.NullPointerException: 	at okhttp3.HttpUrl.canonicalize(HttpUrl.java:1853)	at okhttp3.FormBody$Builder.add(FormBody.java:110)	at com.donateblood.blooddonation.UploadImage$AddUserAsync.doInBackground(UploadImage.java:203)	at com.donateblood.blooddonation.UploadImage$AddUserAsync.doInBackground(UploadImage.java:173)	at android.os.AsyncTask$2.call(AsyncTask.java:288)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)	at java.lang.Thread.run(Thread.java:864)