I don't know what to do - pi no longer booting

[aalleexx]

Hi, after using raspberry pi for a few months, i have Just got This error msg and raspi is not booting.
Have someone a solution or an explanation?
If it couldn't be solved, can I save my files?
Thank you.

[elatllat]

copy your card with dd

Recover files with PhotoRec

Backup with git/rsync/rdiff-backup/etc

[aalleexx]

Thank you elatllat, i'll try it later.

[DougieLawson]

You need to fsck your root filesystem.

Easiest way to do that is boot another card, mount the broken card in a USB SDCard reader and use
for i in a1 a3 a5 a6; do sudo fsck -f -y /dev/sd$i; done in a command window.