Installing Marketpress Collapsed the site

Hello,
After installing Marketpress plugin, I could not login to any part of admin url and getting this error ""Parse error: syntax error, unexpected T_FUNCTION in /home/thinkc11/public_html/testtbi1/wp-content/plugins/marketpress/includes/common/class-mp-installer.php on line 157"'

Kindly advice
Many Thanks
DILEEP