Oracle Solution for Error ora-14061

ORA-14061: data type or length of an index partitioning column may not be changed

What triggered the Error:

User issued ALTER TABLE statement attempting to modify data type and/or length of a column used to partition some index defined on the table named in ALTER TABLE statement, which is illegal

What should we do to fix it:

Avoid modifying data type and/or length of index partitioning column(s)