request cannot be completed due to pending hot standby command

  Explanation:  A Hot Standby command was pervious requested  from
  this  node  using the /NOWAIT qualifier; the command has not yet
  completed.  The command just requested cannot be completed until
  the  Hot  Standby  feature command already active but pending on
  this node has first completed.

  User  Action:   The  requested  Hot  Standby  command  must   be
  completed  prior  to  issuing  this command.  Use the SHOW USERS
  command to indicate the status of the Hot Standby command.