ORA-30554: function-based index string.string is disabled
Cause: An attempt was made to access a function-based index that has been marked disabled because the function on which the index depends has been changed
Action: Perform one of the following actions: -- drop the specified index using the DROP INDEX command -- rebuild the specified index using the ALTER INDEX REBUILD command -- enable the specified index using the ALTER INDEX ENABLE command -- make the specified index usable using the ALTER INDEX UNUSABLE command
https://support.oracle.com/
http://www.oracle.com/