Can you post the script that you've got after removing the 2000 part out? I tried doing the same and it worked with out any problem.

try doing it like this (All i am doing here is enclosing the 3 part names in square parentheses):

FROM [?].[sys].[database_principals] u

LEFT JOIN ([?].[sys].[database_role_members] m

JOIN [?].[sys].[database_principals] r

ON m.role_principal_id = r.principal_id)

ON m.member_principal_id = u.principal_id

LEFT JOIN [?].[sys].[server_principals] l

ON u.sid = l.sid

Replace the code in the "from"clause with this.

See if you have any spaces in the name of the database.