Memory error issue on loggin in wp-admin dashboard

Hi , I had successfully updated few plugins then I went ahead to update wordpress but it was unsuccessful.

But then when I tried logging into my wp-admin dashboard I am getting this error

Fatal error: Allowed memory size of 262144 bytes exhausted (tried to allocate 376984 bytes) in /home/ravsworl/public_html/wp-admin/index.php on line 13

My website is http://ravsworld.com

I tried all these steps:1) Increased memory limit in wp-config file2) Renamed all the plugins folder using FTP connection

Still I am unable to solve this issue.

Please help me resolve this issue as neither me nor my webhosting provider has recent backup to do rollover.

Thanks & regards,Ravindra