title: Pushwoosh create message get 200, but say UnknownDevices
body: <p>My system running at least two years. Most push notification requests got 200. But, recently, I found I got 500 frequently. </p>
  
  <p>Nealy 10% push notifications got 500.</p>
  
  <p>Please HELP!!!</p>
  
  <p>I have resend the problem messages, every thing is fine.  </p>
  
  <p>Example:
  Request is: </p>
  
  <pre><code>{
    "request": {
      "application": "3DXXX-59XXX",
      "username": "MyXXXXX",
      "password": "********",
      "notifications": [
        {
          "send_date": "now",
          "content": {
            "en": "Subscriber ID. 9000  Close  User 01"
          },
          "link": "",
          "data": {
            "userID": "12345"
          },
          "wp_type": "",
          "wp_background": "",
          "wp_count": "",
          "ios_badges": 51,
          "ios_sound": "short-tone.caf",
          "devices": [
            "APA91bHZHEhIMjVYwxyMk-4-YObazHfcxlQq7CmYto930nuIqHlQGCdzUQsnDcnHTB78wUcTlm-qhV3ipMqe9HO3kTqD9j_zgzSUUAdoGK0fbeRRGMNn69Z63BlQ9RqIdioZ4J2NFA0DLOUkroImk-it8p_3Glr5bRlnrl1_wT3ycXfsgvQZq4g"
          ],
          "page_id": "0",
          "android_sound": "five_sectoneone"
        }
      ]
    }
  }
  </code></pre>
  
  <p>Response is: 
  {"status_code":500,"status_message":"Invalid devices list"}</p>
  
  <p>==============================================================<br>
  ========================= Update =============================  </p>
  
  <p>After I upgrade Pushwoosh API from V1.2 to V1.3, the problem is gone.</p>
  
  <p>However, new problem comes.</p>
  
  <p>My sample is:</p>
  
  <p>request :</p>
  
  <pre><code>{
    "request": {
      "application": "3DXXX-59XXX",
      "auth": "*********WqLiS5ZM2****************************************9eib******",
      "notifications": [
        {
          "send_date": "now",
          "content": {
            "en": "Jones Residence Tue,17Jul 12:12 Test from Robbie......."
          },
          "link": "",
          "data": {
            "userID": "12345"
          },
          "wp_type": "",
          "wp_background": "",
          "wp_count": "",
          "ios_badges": 39,
          "ios_sound": "short-tone.caf",
          "devices": [
            "298eeXXXXa26849cc77da16adXXXXc1c801df12e79bad1e724829aXXXXcbe07d"  //I hashed real ID here
          ],
          "page_id": "0",
          "android_sound": "five_sectoneone"
        }
      ]
    }
  }
  </code></pre>
  
  <p>Response is:</p>
  
  <pre><code>{
    "status_code": 200,
    "status_message": "OK",
    "response": {
      "Messages": [
        "D954-3C45B1AA-AA6293E5"
      ],
      "UnknownDevices": {
        "D954-3C45B1AA-AA6293E5": [
          "298eeXXXXa26849cc77da16adXXXXc1c801df12e79bad1e724829aXXXXcbe07d" //I hashed real ID here
        ]
      }
    }
  }
  </code></pre>
  
  <p><img src="https://community.pushwoosh.com/upfiles/Screen_Shot_2014-07-15_at_4.34.37_PM.png" alt="alt text"></p>