Command line upload => "Problem: does not exist"

I'm on 64-bit Ubuntu, so there is no graphical client available -- I can only use the command line client.

I'm in a directory with a file named "blah.txt". From the command line, I enter the command (for example):
wuala upload blah.txt myfiles

I get the output:
Uploaded blah.txt into /(my login)/
Problem: 'blah.txt' does not exist

I get this no matter what file I specify with the first argument.

I have succesfully uploaded files from the graphical client on a Windows machine. From my Linux box, I am able to see those files using the "list" command. I am successfully logged in and trading 100GB of storage space, with other users using about 7GB of it so far. But I have been unable to upload any of my own content yet to take advantage of the storage I have earned.

I cannot use the NFS mount provisions, because my box is already an NFS server and I don't want to mess that up. So I really need to get this to work with the wuala command line client.

Thanks for any help you can provide.