Error: Revolution Slider Activation

I am using the SEO demo theme....i've tried to activate the Revolution Slider and am getting this error: 

Parse error: syntax error, unexpected T_FUNCTION in /home1/ativotec/public_html/ativotechnologies/wp-content/plugins/revslider/inc_php/revslider_slider.class.php on line 851

Can someone help with this?
Thanks....

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