Digi error codes

hi all,

today put my card in as per norm, adjusted finish time for last trip all seemed ok, did my checks then set off, got about 10 miles then tacho unit made a whirring sound and ejected my card saying “card error code 50” does anyone know what exactly this means pls??
only thing i can think of is that the card was downloaded this morn could that have anything to do with it? and i take it i,m ok just making a hard copy of my driving times ect? it was reported to office first thing and a truck changeover is planned for tomoz…

will i need to apply for a replacement card?

cheers