I updated and started the instance. When it did'nt work I tried a clean install but I still get these errors:
014.11.23 17:48:38: The file '/home/sdtd/engine/7DaysToDie_Data/mainData' is corrupted! Remove it and launch unity again!
2014.11.23 17:48:38: [Position out of bounds! 2051396 > 2051392]
2014.11.23 17:48:38: The class named 'Localization' is abstract. The script class can't be abstract!
2014.11.23 17:48:38: Version: Alpha 10 (b52) Compatibility Version: Alpha 10, OS: Linux 32 Bit
2014.11.23 17:48:38: Last played version: Alpha 10
2014.11.23 17:48:38: Command line arguments: /home/sdtd/engine/7DaysToDie.x86 -logfile /home/sdtd/instances/SjuPimps/logs/output_log.txt -configfile=/home/sdtd/instances/SjuPimps/config.xml
2014.11.23 17:48:38: Error parsing property 'PlayerDamageGiven'. Message: The requested value 'PlayerDamageGiven' was not found.
I deleted the instance and made a new one and now it started.