Board Thread:Questions and Answers/@comment-121.54.92.86-20130622002930/@comment-67.185.166.117-20130702205002

Response from Zynga:

"There is a possibility that the player has been challenged or has already changed their status"

"However, try the following steps to refresh and reload that game on your device. To do this: - delete the cached files in the game

1. Launch the game app

2. Go to Settings

3. SCroll down and tap the "delete cached files"

4. Choose "clear" to refresh the game cache

5. Check the game"