Redhat Server is showing file system error in messages file

HI Community,

while checking the messages file i found below alerts related to file system and it's reoccurring every day .

Apr 3 17:35:34 phcorc-gl kernel: EXT4-fs (sda2): error count: 18
Apr 3 17:35:34 phcorc-gl kernel: EXT4-fs (sda2): initial error at 1457527603: ext4_journal_start_sb:350
Apr 3 17:35:34 phcorc-gl kernel: EXT4-fs (sda2): last error at 1457531221: ext4_mb_generate_buddy:742

what is this error message about and it this critical. ? How can i fix this?

Regards,
Ben