Error Warning preg_match Compilation failed missing at offset

I get this error message after installing RoundtheWorld theme - it appears in red on the top of my page.
I have the same with other SMThemes, but not with other themes.
I do want to keep using RoundTheWOrld, but I can't figure out how to resolve this.

error message:
Warning: preg_match(): Compilation failed: missing ) at offset 166 in /usr/local/pem/vhosts/133676/webspace/siteapps/WordPress-31364/htdocs/wp-content/themes/roundtheworld/inc/library.php on line 396 Warning: preg_match(): No ending delimiter '/' found in /usr/local/pem/vhosts/133676/webspace/siteapps/WordPress-31364/htdocs/wp-content/themes/roundtheworld/inc/library.php on line 396