Hi,
I am a passionate PHP developer doing such projects for around 4 years. I have good knowledge and experience in PHP, Mysql, HTML, CSS etc and had done many projects so far.
I saw the error on your site, this may be some run time error. I have fixed similar issues in the past as part of my projects. So, I can do it in minimum time and cost. If you give me a chance, we'll surely have a good deal ahead.
Thanks