when i launched my 5 dof robot arm urdf model in rviz its showing no transform between link 1 to link4.. but transform is ok for link0 and link5...urdf parsed ok. Also in the terminal it shows

root@psg-OptiPlex-390:/opt/ros/electric/stacks/al5b_arm# rosrun rviz rviz -d idk.vcg

[ERROR] [1357195233.002738831]: wxWidgets Error [librvizinteractiontools.so: cannot open shared object file: No such file or directory] [ERROR] [1357195233.002854989]: Unable to load library [/opt/ros/electric/stacks/pr2objectmanipulation/perception/objectrecognitiongui/lib/libobjectrecognitionguirvizplugin.so] [ERROR] [1357195233.003402996]: wxWidgets Error [librvizinteractiontools.so: cannot open shared object file: No such file or directory] [ERROR] [1357195233.003478748]: Unable to load library [/opt/ros/electric/stacks/pr2objectmanipulation/perception/objectsegmentationgui/lib/libobjectsegmentationguirvizplugin.so]

the inverse kinematics shows a result when i do rosrun hitec getik root@psg-OptiPlex-390:/opt/ros/electric/stacks/al5barm# rosrun hitec get_ik [ INFO] [1357196391.828161237]: Joint: Joint0 0.500764 [ INFO] [1357196391.828294269]: Joint: Joint1 0.892771 [ INFO] [1357196391.828362042]: Joint: Joint2 0.107373 [ INFO] [1357196391.828435366]: Joint: Joint3 0.500772 [ INFO] [1357196391.828466473]: Joint: Joint4 0.500045

can anybody explain the problem