This issue can occur for several reasons, the most common are:

  1. The story was removed or reported by you: I reported/removed a story and now I can't read it.
  2. The story was removed by Episode for content violations: Why are stories removed from the app?
  3. The story has a coding error that the author needs to fix. 
  4. The story has a file that is unable to be downloaded to your device. You can try troubleshooting your device to see if that fixes the issue: