Brother MFC-7420 Scanner on Ubuntu 12.04: Invalid Argument

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http://askubuntu.com – I have a Brother MFC-7420, which also works as a scanner. I have attached this machine to a computer running Ubuntu 12.04 LTS 64bit via USB. I installed the following package: brscan2-0.2.4-0.i386.deb Now when I start xsane, the device is detected. However, when I try to scan or run a preview scan, I get the message Invalid Argument. What can I do to get this scanner running? (HowTos)