我用最简单的表单上传却报{"error":"download token not specified"}

<code><form id='form' method="post"  action="http://7xjphu.com1.z0.glb.clouddn.com/" style="width:86%; margin:20px auto 40px; padding:50px 100px;" enctype="multipart/form-data">

  <input type="file" name='file' id="exampleInputFil" style="float:left; width:70%; height:32px;" accept="image/*" capture>                       

  <input name="token" type="hidden" value='<?php echo $token;?>' >

 <button id='submit' type="submit" class="btn btn-default" style="height:32px; line-height:14px; background:#209de5; border:0px; color:#fff;" >上传</button>       
</form>  
</code>

<code><form id='form' method="post"  action="http://7xjphu.com1.z0.glb.clouddn.com/" style="width:86%; margin:20px auto 40px; padding:50px 100px;" enctype="multipart/form-data">

  <input type="file" name='file' id="exampleInputFil" style="float:left; width:70%; height:32px;" accept="image/*" capture>                       

  <input name="token" type="hidden" value='<?php echo $token;?>' >

 <button id='submit' type="submit" class="btn btn-default" style="height:32px; line-height:14px; background:#209de5; border:0px; color:#fff;" >上传</button>       
</form>  
</code>