Just so you know, zuka.dlg is for the second time you go to Onderon, and I already had that issue and fixed it on my end. The file for the first time to Onderon, which I'm sure is what you're talking about, is sith_att.dlg. So if you're trying to go to Onderon for the first time, then you're removing the wrong file. My question regarding this file is whether you can still use the item on Onderon.
If you put zuka.dlg back in and remove sith_att.dlg, then try reinstalling, you should be able to get to Onderon. Once that happens, if you can still use the item, please let us know. That way, I know to just remove that pointless file from future versions.