mkportal error which intregated with phpbb forum

[bobkom]

am getting this error "Warning: mysql_connect(): Access denied for user: 'smile_phpbb2@localhost' (Using password: NO) in /home/smile/public_html/mkportal/include/mk_mySQL.php on line 25

Warning: mysql_select_db(): supplied argument is not a valid MySQL-Link resource in /home/smile/public_html/mkportal/include/mk_mySQL.php on line 28
ERROR: Cannot find database smile_phpbb2
Warning: mysql_query(): supplied argument is not a valid MySQL-Link resource in /home/smile/public_html/mkportal/include/mk_mySQL.php on line 38
ERROR: Database error. Cannot execute the query"

after updating my forum with auoto_cookies mod and upgrading to 2.0.17 to 2.0.18

forum working fine but got this error in main page and other pages.. my site is mkportal intregated with phpbb forum..

plz guide me..