public final void error(Object o){
  if (console != null)   console.error("// Error: " + o + "\n");
 else {
    err.println("// Error: " + o);
    err.flush();
  }
}

public final void error ( Object o ) { if ( console != null ) console . error ( "// Error: " + o + "\n" ) ; else { err . println ( "// Error: " + o ) ; err . flush ( ) ; } }
print an error message in a standard format on the output stream associated with this interpreter . on the gui console this will appear in red , etc .
