errors in mysql syntax

[RAMYA]

ALTER TABLE TimeTracker.TT_ProjectMembers ADD 
        CONSTRAINT FK_Roles_Projects FOREIGN KEY 
        ( 
                ProjectID 
        ) REFERENCES TimeTracker.TT_Projects ( 
                ProjectID 
        ) ON DELETE CASCADE , 
        CONSTRAINT FK_WorksOn_Users FOREIGN KEY 
        ( 
                UserID 
        ) REFERENCES TimeTracker.TT_Users ( 
                UserID 
        ) 



As iam new to this mysql when i was doing the program mysql shows the error
as 

You have an error in your SQL syntax; check the manual that corresponds to
your MySQL server version for the right syntax to use near 'CONSTRAINT
FK_WorksOn_Users FOREIGN KEY 
        ( 
                UserID 
        ) REFERENCES TimeTracke' at line 8 


what to do if this error comes plz anyone help me 



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