@q20: never had such an error. Installation and Startup on every testsetup went OK so far. Did you change something else on your SD-Card-image? The error is indicating missing user rights to start the squeezebox server – maybe your installation is broken (SD-card error). In this case you should start with a fresh SD-Card-Image.
Make sure to install Squeezebox Server Nightly 7.9 (otherwise it won’t start because of missing libraries).