relation "<str>"  referenced  in  the  default  transaction  for
  module "<str>"

  Explanation:  An attempt was made to perform  DROP  TABLE  on  a
  table   referenced  by  the  RESERVING  clause  in  the  default
  transaction for a module.

  User Action:   First,  review  the  database  design;  then,  if
  desired, drop the module, and then delete the relation.  Use the
  CASCADE option to avoid this error and leave the module  intact.
  Note  that  attempts  to  use the module without re-creating the
  table will fail.