I am using POI 4.0 and if I understood it correctly, then IFERROR function 
should have been implemented long ago, right?

Then why do I get this exception?

Caused by: org.apache.poi.ss.formula.eval.NotImplementedFunctionException: 
_XLFN.IFERROR
    at 
org.apache.poi.ss.formula.UserDefinedFunction.evaluate(UserDefinedFunction.java:56)
    at 
org.apache.poi.ss.formula.OperationEvaluatorFactory.evaluate(OperationEvaluatorFactory.java:146)
    at 
org.apache.poi.ss.formula.WorkbookEvaluator.evaluateFormula(WorkbookEvaluator.java:534)
    at 
org.apache.poi.ss.formula.WorkbookEvaluator.evaluateAny(WorkbookEvaluator.java:275)

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