If you use something like FileZilla, you can access the default-filters.php and see what is wrong with line 231 and change it.
Bless you Laura! I do have Filezilla.
This is line 231: Do you have any idea???
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I am not really familiar with php. I am sorry. Maybe someone else knows?
Your site has been hacked. Try a forum search for hacked to find info on how to fix it.