contact form not working

Hello all, sorry for my english, i have à problem, contact form not working in my theme karolina. I send mail but the result are a blank page

Thanks

Here is the solution that I find by activating "debug" in wordpress: I have changed the php version on my webserver from php7 to php5.6 and everything works perfectly. If someone encounters the same error.

Hi there!
Thanks for sharing a solution for this issue. I'm sure it will be much appreciated by our users.