errors in mysql syntax

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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