ContactForm7 Blank White Screen Error 524

Hi,

I’m getting an Error 524 on my site whenever I activate ContactForm7.

It’s the only plugin that causes the error 524. My site is on Cloudflare. I deleted the plugin which worked on my site for years and it hasn’t worked for 2 weeks now. I believe my site was hacked but the only plugin that not working is this plugin which I use to communicate with website visitors.

Please help me fix this problem.

http://wordpress.org/plugins/contact-form-7/