Failed to initialize cache data

Hello,

We are receiving bug reports from numerous users that look like this:

Failed to initialize cache for the AssetBundle 'http://url.to.assetbundle'. URL: http://url.to.assetbundle

Our code for loading any assetbundle looks like this:

Code (csharp):

1.  
2. while (!Caching.ready)
3.   yield return null;
4. using (WWW www = WWW.LoadFromCacheOrDownload(url, version))
5. {
6.   yield return www;
7.   if (!string.IsNullOrEmpty(www.error)) {
8.     Debug.LogErrorFormat("WWW download failed {0}: {1}", fullurl, www.error);
9.   }
10.   else
11.   {
12.     // do something with the bundle
13.     www.Dispose();
14.   }
15. }
16.  

What can I do about this? What could be the reason that the user's cache could not be initialized? Unfortunately we cannot reproduce this ourselves, but we receive lots of these errors via bugsnag.

Thank,
Alex

 

I have the same problem sometimes. It is hard to reproduce. How to solve it?