attach not allowed while your process is being recovered

  Explanation:  The database recovery process (DBR)  is  currently
  recovering  an  image  for  your  process.   While  the recovery
  operation is  running,  you  cannot  start  another  image  that
  attempts to attach/bind to the database.

  User  Action:   You  can  attach/bind   to   another   database.
  Otherwise,  you  must  wait for the database recovery process to
  complete recovery of your previous image.