what is " E:failed to mount /data (invalid argument) " in recovery mode ?!

hi .
I have a Samsung galaxy note 4 . I hold volume up and power button to enter recovery mode and when I click on reboot system now , after few seconds the red error message "e:failed to mount /data (invalid argument) " appears below but the phone reboots successfully and it works fine again . I did a full factory reset and i get this message again . I want to know why i get this message ? does it have any effect on system performance ? because it was slower than other note 4s from the beginning but not noticeable but after a couple of months of using the phone it sometimes gets so slow and lagging sometimes .
here is attached the screenshot of the error i get second before the phone reboots :

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