Debug File for Forum (YAF forum software) - repost

Hi- There is a scripting error in my forum files causing a ton of crawl errors. I checked with hosting who tells me this: "It is definitely a coding / scripting error in your most probably “[login to view URL]” file. Kindly consult your web developer to look into this matter as we do not provide coding level assistance. The Stack Trace information on your provided URL clearly shows a coding level issue." I also need someone who is capable of checking vulnerabilities to prevent injection or hacking. I need someone available immediately to make the fixes. Time sensitive. Thanks.