Hello,

I am following the <link href="http://www.ros.org/wiki/sbpl_lattice_planner"> sbpl_lattice_planner example </link> and when I do,

roslaunch sbpl_lattice_planner move_base_sbpl_fake_localization_2.5cm.launch

I get the following error message

terminate called after throwing an instance of 'ros::TimeNotInitializedException' what(): Cannot use ros::Time::now() before the first NodeHandle has been created or ros::start() has been called. If this is a standalone app or test that just uses ros::Time and does not communicate over ROS, you may also call ros::Time::init() [nav_view-6] process has died [pid 4647, exit code -6].

Basic system info:

OS: Ubuntu 11.04 64bit
ROS Distribution: Diamondback

I would appreciate if someone could help me out with this problem.

[Answer to Eric's comments: Below]

Thanks Eric for your comments. But I have some more issues now.

Case 1: ROS Fuerte with Ubuntu 12.04

I tried the following:

First, I "rosmade" (with 'rosmake' of course) both 'sbpl_lattice_planner' and 'sbpl' packages.

Then, I modified the following line from a .xml file

< node name="nav_view" pkg="nav_view" type="nav_view" respawn="false" >

to

< node name="rviz" pkg="rviz" type="rviz" respawn="false" >

The error message that I originally got is gone (because I am using rviz instead of nav_view), but then I get the following error message:

[stageros-5] process has died [pid 21723, exit code -11

I tried to search the meaning of this exit code (-11) from the source file (stageros.cpp), but the only two exit values that I could find were 0 and -1.

stageros node is launched from the "move_base_sbpl_fake_localization_2.5cm.launch" file (a launch file that came with the sbpl_lattice_planner" package). Please see the following:

< node pkg="stage" type="stageros" name="stageros" args="$(find sbpl_lattice_planner)/worlds/willow.world" respawn="false" >

< param name="base_watchdog_timeout" value="0.2" />

< /node >

Of course I have the willow.world file in the right path.

Case 2: ROS Diamondback with Ubuntu 11.04

I tried the exact same steps as on ROS Fuerte (that is using rviz instead of nav_view), then I don't have any problem with the stageros. But, the robot doesn't move, and when I echo the /cmd_vel topic I get the following WARNING message:

WARNING: no messages received and simulated time is active. Is /clock being published?

But when I echo the /clock topic, I see that the /clock topic is being published.

Request

Any help for both cases or any of them will be appreciated.