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Hi,

have you installed all system dependencies? (execute the apt-get command generated by 'rosdep satisfy knowrob'). It sounds like Java is not correctly installed on your system. After this, try a 'rosmake --pre-clean knowrob'

If that does not help, some information about your setup would help (Java JDK type and version, OS version, which command produces this error etc).

thanks, Moritz

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