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Because the repository login credentials where not yet sent over "the wire" we could not offer a solution for this problem in version 2.5.x.
Version 3.0.0 fixes this issue by including passing the repository name, userid user name and password to the slave server.
Please note that the slave server has to be aware of the location of the repository. Normally, the file $HOME/.kettle/repositories.xml is referenced for this. However, you can also copy this file into the directory in which you started Carte (the local directory).
Even if you set this up correctly, verify that the slave server can reach the repository database over the network and that the repository database contains permissions for the slave server to access it.