Error "Cannot send session cache limiter"

Hello All,

My website was working fine this afternoon.

I added few products via admin login and added link to the banner on the home screen.

Didnt change anything else.

Came home in the evening and just saw this error now popping up on all the pages

Error
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Warning: session_start(): open(/tmp/sess_853510e752d94837acc5e4874505d815, O_RDWR) failed: Read-only file system (30) in /var/www/vhosts/1/129998/webspace/httpdocs/dev.gameskeysaustralia.com/system/library/session.php on line 10Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /var/www/vhosts/1/129998/webspace/httpdocs/dev.gameskeysaustralia.com/system/library/session.php:1) in /var/www/vhosts/1/129998/webspace/httpdocs/dev.gameskeysaustralia.com/system/library/session.php on line 10

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I have looked up all the forums to see what can be done abt it.

But none of the suggestions are working for me.

I am not hosting with godaddy.

Please help.

Thanks in advance