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Warning: creating filesystem that does not conform to ISO-9660.
Warning: creating filesystem with (nonstandard) Joliet extensions
but without (standard) Rock Ridge extensions.
It is highly recommended to add Rock Ridge
INFO: UTF-8 character encoding detected by locale settings.
Assuming UTF-8 encoded filenames on source filesystem,
use -input-charset to override.
mkisofs: No such file or directory. Invalid node - o

Another issue is a path of filename. Shouldn't it be ../ubcd34.iso instead /ubcd34.iso ? Second one tries to write image in the root filesystem and this is not what I want

With those slight changes I was able to create iso image.
But what about those extension warnings? Why not to add Rock Ridge?