Ultimate branding shows error in network admin

Hi,

I installed ultimate branding and tried changing the link of "Learn more about getting started" from admin dashboard.

What I did is, Copied the link of "Learn more about getting started" which is

and in replace box I pasted,

/getting started/

Site Network admin throws the following error,

Warning: preg_replace(): Unknown modifier '\' in /home4/aathi/public_html/wp-content/plugins/ultimate-branding/ultimate-branding-files/modules/site-wide-text-change.php on line 439

Help to solve this please