Fix some errors in a couple of webpages

Hi, I purchased a PHP software script and have installed it and customised the look of the script into my site. There are a couple of pages which have an error on there which I have narrowed down possibly to a line in a file called [login to view URL] I need someone to find the errors on around 10 pages (likely to be the same error) and fix the issue. There will be another job that will follow this which I will give to the person who does this if I am happy with their quick service. Thanks