Due to a combination of your chosen service level and address data (sender, receiver), the carrier cannot determine a transit time. Please check if you've entered the correct data and service level combination. 

Some handy tools you can use to check if a carrier can find a transit time for your chosen destination are:

UPS: https://wwwapps.ups.com/ctc/request?loc=nl_NL&WT.svl=PNRO_L1

TNT: https://www.tnt-tools.com/servicetrackertest/default.aspx

DHL: http://dct.dhl.com/