Error while detecting markers using ar_track_alvar [closed]

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Hello guys,

I'm still new to ros. and at the moment I'm using ar_track_alvar to detect markers. so far I was able to detect them and show them on Rviz but it only flashes the location of the markers then it gives me this error :

/usr/include/eigen3/Eigen/src/Core/DenseStorage.h:69: Eigen::internal::plain_array<T, Size, MatrixOrArrayOptions, 16>::plain_array() [with T = float, int Size = 4, int MatrixOrArrayOptions = 0]: Assertion `(reinterpret_cast<size_t>(array) & 0xf) == 0 && "this assertion is explained here: " "http://eigen.tuxfamily.org/dox-devel/TopicUnalignedArrayAssert.html" " **** READ THIS WEB PAGE !!! ****"' failed. Aborted (core dumped)

Any idea what would be causing this ?

I'm simply running:

roscore

roslaunch openni_launch openni.launch

rosrun ar_track_alvar individualMarkers 4.4 0.08 0.2 /camera/depth_registered/points /camera/rgb/camera_info /camera_rgb_optical_frame   

rosrun rviz rviz

Thank you for your help!