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I don't get any point-cloud when i set keyframes as topic in rviz(without the service). Is it necessary to call the rosservice generate_graph ? I tried it,but i get this Error:

ERROR: service [/generate_graph] responded with an error: /tmp/buildd/ros-groovy-opencv2-2.4.5-2precise-20130519-1747/modules/features2d/src/matchers.cpp:91: error: (-215) imageCount > 0 in function set

What can i do?