"compilation failed" warning

By UUA Web Team
January 21, 2018, 4:15 pm EST
We have installed Version 1.1 on our site here in Philadelphia (usguu.org) without a hitch, aside from this problem. Hidden behind the background color, but visible, in the space just above the header of all pages but the homepage, the following error message appears: Warning: preg_match(): Compilation failed: nothing to repeat at offset 1 in /home/usgadmin/www.usguu.org/wp-includes/class-wp.php on line 218
Warning: preg_match(): Compilation failed: nothing to repeat at offset 1 in /home/usgadmin/www.usguu.org/wp-includes/class-wp.php on line 219 Does anybody know how I can fix that?