Oracle Message ORA-14053 - illegal attempt to modify string in string statement

ERRORillegal attempt to modify string in string statement
CAUSECertain attributes of objects (e.g. tables) may be specified at creation time, but may not be modified using ALTER statement. Unfortunately, user specified one of such attributes.
ACTIONEnsure that ALTER statement specifies new values only for attributes which may be changed once an object has been created