can't detect full path

Re: http://www.posswholesale.com

I just downloaded & installed a plugin called P3 (PLUGIN PERFORMANCE PROFILER), then the whole site was not operatable, and it shown
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(can’t detect full path [/home/posswholesale/posswholesale.com/wp-admin/tools.php]
[e1]
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I was not sure if it is because of the plugin or not, but the whole site is not working, and can’t even log-in nor visit again.

I need help to solve the above at top urgent.

B.Rdgs
Samuel
Email: [email protected]