Linked Server Error from SQL2008R2 to SQL2000

I am trying to Execute Query/SP from my local machine which SQL 2008R2 To SQL 2000 32 bit. 

Created Linked Server from Local machine to SQL2000 Machine..

Query /SP run fine from SSMS but when I am trying to run through this below script keep giving me error .

I converted Select query into SP 

 EXEC msdb.dbo.sp_send_dbmail
    @profile_name = 'SQL-MailAlerts',
    @recipients = '**********',
    @query = 'EXEC dbo.QueryResult',
    @query_attachment_filename = 'result.csv',
    @attach_query_result_as_file = 1,
    @body_format = 'text' ;

Error :

Msg 22050, Level 16, State 1, Line 0
Error formatting query, probably invalid parameters

Msg 14661, Level 16, State 1, Procedure sp_send_dbmail, Line 504

Linked servers cannot be used under impersonation without a mapping for the impersonated login.

Basically trying to get Query result from SQL 2000 Database into mail if anyone has better idea let me know.

Thanks

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