Indexes....

Hello Everybody: My problem is like follow: I have a table with many thousands of rows, and that has indexes, if I drop the indexes and then re-create them, I get the following error: -103 ISAM error: illegal key descriptor (too many parts or too long). The ISAM processor has been given an invalid key descriptor. C-ISAM programs: Review the key descriptor. There is a maximum of 8 parts and 120 characters to each key descriptor. SQL products: Should not occur; please note all circumstances and contact the Informix Technical Support Department. Does everybody know how to drop and then create indexes in a table, without this problem ? The same problem occurs when I creates indexes in a table with many rows.