The problem is not with the WP Admin, but as you are directed and you already is there, the plugin p3-profiler.
If you have the cpanel access, just get into the wp-content/plugins/ folder and move the folder p3-profiler on step up (so that it would go to the wp-content/ folder, and out of the /plugins folder.
I think then you can get into your wp-admin without any hassle.
Additional: for plugin related issues, please contact with the plugin author directly by their support forum or wordpress.org support forum to get the direct reply from the plugin author, and that would be the best.
Hope that helps.
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