Did you use the new rev 6211? There should not be an error any more. At least if you run the program outside the IDE. Inside the IDE, i.e. the debugger, there will be an exception message because the file written by Calc does contain the external reference which is still unknown to fps. Adding EExprParser and ECalcEngine to the list of ignored exceptions (Tools > Options > Debugger > Language Exceptions > Add, type EExprParser, OK, then Add, and type ECalcEngine) fixes this.