Parse Error on Login to wp-admin

I am unable to login to wp-admin on a website and keep getting this error:

Parse error: syntax error, unexpected ”lessc_pa’ (T_ENCAPSED_AND_WHITESPACE), expecting ‘)’ in /home/relleuco/public_html/wp-content/plugins/all-in-one-event-calendar/lib/class-ai1ec-loader-map.php on line 1442

I appreciate that the calendar plugin may need uninstalling and installing again, but every time I try to login, this error message comes up. Can anyone tell me how I can get round this please?

Thanks in advance for any advice!