Cant cancel flights - internal error

I wanted to cancel some flights of my plane, as due to schedule change some are to happen at the same time/overlapping. I selected the flights to cancel, and pressed cancel selected flights on the aircraft's flights screen, I get an "internal error" message as a result... What can I do now?

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Please don't forget to mention: Gameworld, Airline, Reg of the aircraft and Flight-No. and date you want to cancel.


However, funnily enough, I opened the aircraft once more now, and the first of the 3 flights I wished to cancel was cancelled already. I tried to cancel other two, and it worked now...