End rage in exportMeasure

Hi,

I was trying to run an exportMeasure where I don't need to provide end range and only start range.

exportMeasure -d ${RDF_DOMAIN} -out ${EXPORT_DIR}/${exp_file_name}.csv.ovr -intx ${exp_meas_intx} -meas ${export_meas} -processes ${RPAS_MAX_THREAD}  -range ${start_range}:${null}

But it not working and threw error.

So is it mandatory to always provide this ; if so please suggest me how to get the data as my requirement is to export data stating from today to future any date up to what data is available.

Thanks.