Fatal error: Allowed memory size of 12582912 bytes exhausted

I had a wordpress site that was running perfectly on finance4impact.in for a month. I installed a plugin to update my user profile from the front end and after that i keep getting this error :

Fatal error: Allowed memory size of 12582912 bytes exhausted (tried to allocate 3072 bytes) in /home/a6cc8b50/public_html/wp-content/themes/oneup/framework/php/PeTheme/PeThemeController.php on line 939

I have increased :
1) my memory limit for php by editing php.ini
2) defining memory limit in wp-config.php
3) using ini_set(“memory_limit”,”256M”); on individual scripts

but nothing works. Now I can view the webpages of the site but I cant go to the wp-admin page

Also even after increasing memory limits, the error message still says Allowed memory size of 12582912 bytes
I have a feeling that the increase in memory limits are not taking place..

Any pointers?