Problem after installing DRCSim

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I've had ROS and Gazebo working fine (Hydro and Gazebo 1.9 on Ubuntu 12.04). Today I installed DRCsim, and now when I try ROSlaunching (or ROSrun) a gazebo_ros package I get the following error:

[gazebo-2] process has died [pid 10651, exit code 127, cmd /opt/ros/hydro/lib/gazeboros/gzserver worlds/willowgarage.world _name:=gazebo __log:=/home/nbanyk/.ros/log/ebba1d2e-1c34-11e4-9f03-00216a935c82/gazebo-2.log]. log file: /home/nbanyk/.ros/log/ebba1d2e-1c34-11e4-9f03-00216a935c82/gazebo-2*.log

[gazebogui-3] process has died [pid 10656, exit code 127, cmd /opt/ros/hydro/lib/gazeboros/gzclient _name:=gazebogui _log:=/home/nbanyk/.ros/log/ebba1d2e-1c34-11e4-9f03-00216a935c82/gazebogui-3.log]. log file: /home/nbanyk/.ros/log/ebba1d2e-1c34-11e4-9f03-00216a935c82/gazebo_gui-3*.log

Currently in my .bashrc file I have the following (bottom two lines were commented because I was troubleshooting to see if that would help): source /opt/ros/hydro/setup.bash source ~/catkinws/devel/setup.bash export GAZEBOMODELPATH=/home/user/catkinws/src/ export EDITOR='nano -w' export GAZEBORESOURCEPATH=/usr/share/gazebo-1.9:/usr/share/gazebomodels:~/catkinws/src source /usr/share/drcsim/setup.sh source /usr/share/gazebo/setup.sh

The interesting thing is that roslaunching the drcsimgazebo package does work, for example: roslaunch drcsimgazebo atlasdrcvehiclefirehose.launch

I saw other related questions on this forum and have tried killing all gzserver's that are running.

Thanks in advance