Database connection problems

What should I do if this error occurs when I connect to the database? Thank you for your help! CDbException description CDbConnection cannot enable the database connection: SQLSTATE [28000] [1045] Accessdeniedforuser 's6411' @ 'localhost'
What should I do if this error occurs? Thank you for your help!
CDbException
Description
CDbConnection cannot enable the database connection: SQLSTATE [28000] [1045] Access denied for user 'zs6411' @ 'localhost' (using password: YES)

SOURCE file
E: \ TopShare \ htdocs \ yii \ framework \ db \ CDbConnection. php (255)

00243 :{
00244: if (empty ($ this-> connectionString ))
00245: throw new CDbException (Yii: t ('yii', 'cdbconnection. connectionString cannot be empty .'));
00246: try
00247 :{
00248: Yii: trace ('opening DB connection', 'system. db. cdbconnection ');
00249: $ this-> _ pdo = $ this-> createPdoInstance ();
00250: $ this-> initConnection ($ this-> _ pdo );
00251: $ this-> _ active = true;
00252 :}
00253: catch (PDOException $ e)
00254 :{
00255: throw new CDbException (Yii: t ('yii', 'cdbconnection failed to open the DB connection: {error }',
00256: array ('{error}' => $ e-> getMessage ())));
00257 :}
00258 :}
00259 :}
00260:
00261 :/**
00262: * Closes the currently active DB connection.
00263: * It does nothing if the connection is already closed.
00264 :*/
00265: protected function close ()
00266 :{
00267: Yii: trace ('closing DB connection', 'system. db. cdbconnection ');
Stack tracing
#0 E: \ TopShare \ htdocs \ yii \ framework \ db \ CDbConnection. php (230): CDbConnection-> open ()
#1 E: \ TopShare \ htdocs \ yii \ framework \ db \ CDbConnection. php (209): CDbConnection-> setActive (true)
#2 E: \ TopShare \ htdocs \ yii \ framework \ base \ CModule. php (353): CDbConnection-> init ()
#3 E: \ TopShare \ htdocs \ yii \ framework \ base \ CApplication. php (373): CModule-> getComponent ('DB ')
#4 E: \ TopShare \ htdocs \ yii \ framework \ db \ ar \ CActiveRecord. php (876): CApplication-> getDb ()
#5 E: \ TopShare \ htdocs \ yii \ framework \ db \ ar \ CActiveRecord. php (2242): CActiveRecord-> getDbConnection ()
#6 E: \ TopShare \ htdocs \ yii \ framework \ db \ ar \ CActiveRecord. php (656): CActiveRecordMetaData->__ construct (Object (public_user ))
#7 E: \ TopShare \ htdocs \ toplinker-web \ protected \ models \ public_user.php (15): CActiveRecord: model ('public _ user ')
#8 E: \ TopShare \ htdocs \ toplinker-web \ protected \ components \ UserIdentity. php (20): public_user: model ()
#9 E: \ TopShare \ htdocs \ toplinker-web \ protected \ models \ LoginForm. php (48): UserIdentity-> authenticate ()
#10 E: \ TopShare \ htdocs \ yii \ framework \ validators \ CInlineValidator. php (39): LoginForm-> authenticate ('password', Array)
#11 E: \ TopShare \ htdocs \ yii \ framework \ validators \ CValidator. php (163): CInlineValidator-> validateAttribute (Object (LoginForm), 'password ')
#12 E: \ TopShare \ htdocs \ yii \ framework \ base \ CModel. php (187): CValidator-> validate (Object (LoginForm), NULL)
#13 E: \ TopShare \ htdocs \ toplinker-web \ protected \ controllers \ SiteController. php (42): CModel-> validate ()
#14 E: \ TopShare \ htdocs \ yii \ framework \ web \ actions \ CInlineAction. php (32): SiteController-> actionLogin ()
#15 E: \ TopShare \ htdocs \ yii \ framework \ web \ CController. php (300): CInlineAction-> run ()
#16 E: \ TopShare \ htdocs \ yii \ framework \ web \ CController. php (278): CController-> runAction (Object (CInlineAction ))
#17 E: \ TopShare \ htdocs \ yii \ framework \ web \ CController. php (257): CController-> runActionWithFilters (Object (CInlineAction), Array)
#18 E: \ TopShare \ htdocs \ yii \ framework \ web \ CWebApplication. php (310): CController-> run ('login ')
#19 E: \ TopShare \ htdocs \ yii \ framework \ web \ CWebApplication. php (120): CWebApplication-> runController ('site/login ')
#20 E: \ TopShare \ htdocs \ yii \ framework \ base \ CApplication. php (135): CWebApplication-> processRequest ()
#21 E: \ TopShare \ htdocs \ toplinker-web \ index. php (11): CApplication-> run ()
#22 {main} 2010-01-25 03:43:00 Apache/2.2.8 (Win32) DAV/2 mod_ssl/2.2.8 OpenSSL/0.9.8g mod_autoindex_color PHP/5.2.5 mod_perl/2.0.3 Perl/v5.8.8 Yii Framework/1.0.10

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