Renaming index gives error Explicit @objtype id not recognised

I am trying to rename an index and getting an error:

Error: Explicit @objtype ‘idx_FinData20’ is unrecognized.

I can see both the table and index exist. Then what is the problem

     IF ( EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'dbo' AND  TABLE_NAME ='FinData2000_1_old'))
     BEGIN

     EXEC sp_rename  'FinData2000_1_old.idx_FinData2000_1' , 'idx_FinData2000_1', 'idx_FinData20 00_1_old'

     end

Answer

First – your syntax is wrong. You need only two arguments, first should be table_name.old_name and second one is just new name. Second – you have an extra space in your new index name which breaks the script.

EXEC sp_rename 'FinData2000_1_old.idx_FinData2000_1' , 'idx_FinData2000_1_old'