Improper error handling (ERR=186)

  After an error has occurred, a program's error handler  calls  another
  program, and the called program executes an ON ERROR GO BACK statement
  before clearing the error with a RESUME statement.  Change the program
  logic  so  that  the  called program clears the error condition before
  executing the ON ERROR  GO  BACK  statement.   This  error  cannot  be
  trapped with a BASIC error handler.