Hello,
As you're using AMD64 distribution I recommend you to use a 64 bits version of OdfConverter that you can download here:
http://katana.oooninja.com/w/odf-converter-integrator/download
If you prefer to use the included version, one of our test server is the same than yours (Debian Squeeze 32 bits) you need to install ia32 packages and refresh folder library.
Regards. Jorge.