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Error in DVD playback

I've read that you can use VLC player to play DVDs from alternate regions so I'm attempting to use the player to play a Japanese DVD from 2002. I can load the start menu, but anything beyond that gives me error messages. When trying to load one file manually, this is what it gave me:

main debug: adding item `VTS_01_4.VOB' ( file:///E:/VIDEO_TS/VTS_01_4.VOB )
qt4 debug: Adding a new MRL to recent ones: file:///E:/VIDEO_TS/VTS_01_4.VOB
main debug: rebuilding array of current - root Playlist
main debug: rebuild done - 17 items, index 15
main debug: processing request item: VTS_01_4.VOB, node: Playlist, skip: 0
main debug: resyncing on VTS_01_4.VOB
main debug: VTS_01_4.VOB is at 16
main debug: starting playback of the new playlist item
main debug: creating new input thread
main debug: Creating an input for 'VTS_01_4.VOB'
qt4 debug: IM: Setting an input
main debug: using timeshift granularity of 50 MiB, in path 'C:\Users\Marcus\AppData\Local\Temp'
main debug: `file:///E:/VIDEO_TS/VTS_01_4.VOB' gives access `file' demux `' path `/E:/VIDEO_TS/VTS_01_4.VOB'
main debug: creating demux: access='file' demux='' location='/E:/VIDEO_TS/VTS_01_4.VOB' file='E:\VIDEO_TS\VTS_01_4.VOB'
main debug: looking for access_demux module: 3 candidates
main debug: Creating an input for 'VTS_01_4.VOB'
main debug: no access_demux module matching "file" could be loaded
main debug: TIMER module_need() : 1583.521 ms - Total 1583.521 ms / 1 intvls (Avg 1583.521 ms)
main debug: creating access 'file' location='/E:/VIDEO_TS/VTS_01_4.VOB', path='E:\VIDEO_TS\VTS_01_4.VOB'
main debug: looking for access module: 3 candidates
filesystem debug: opening file `E:\VIDEO_TS\VTS_01_4.VOB'
main debug: no fetch required for (null) (art currently (null))
main debug: using access module "filesystem"
main debug: TIMER module_need() : 18.984 ms - Total 18.984 ms / 1 intvls (Avg 18.984 ms)
main debug: Using stream method for AStream*
main debug: starting pre-buffering
filesystem error: failed to read (Invalid argument)
main error: cannot pre fill buffer
main warning: cannot create a stream_t from access
main debug: removing module "filesystem"
main debug: dead input
main debug: changing item without a request (current 16/17)
main debug: nothing to play
qt4 debug: IM: Deleting the input
main debug: TIMER input launching for 'VTS_01_4.VOB' : 1632.557 ms - Total 1632.557 ms / 1 intvls (Avg 1632.557 ms)

Did I hear wrong?

You should not open the .vob directly. Open the VIDEO_TS folder with VLC or use the .ifo