Oracle Message ORA-26734 - different datafiles_directory_object parameter must be specified

ERRORdifferent datafiles_directory_object parameter must be specified
CAUSEThe attempted operation involved datafiles platform conversion which required the datafiles_directory_object parameter to be specified for placing the converted data files.
ACTIONRetry the operation after specifying a valid datafiles_directory_object parameter. This directory must be different from the directory objects for any of the datafiles for the specified file group version.