fatal error

Hi There, I face this error after installing jollyany theme, my host is godaddy, The Error I’m Facing Is:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 12288 bytes) in /home/verruca/public_html/whiplashinjury-expert.co.uk/wp-admin/includes/template.php on line 1910

Please Tell Me How To Fix This.