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MoveIt Planning and Execution Fails

asked 2016-12-21 09:14:16 -0500

bhavyadoshi26 gravatar image

updated 2016-12-21 09:58:21 -0500


I am facing some issues with MoveIt. I have a 6 DOF robot and I have created the moveit_config package for it. I have also followed this tutorial and I am able to add objects to the planning_scene and attach them to my robot as well.

However, I am facing problems with the planning and execution in MoveIt. I have followed the Move Group Interface tutorial and I have made some nodes for Joint Space Goals and also Pose Goals. Here is a snippet of my node:

moveit::planning_interface::MoveGroup group("arm");
moveit::planning_interface::PlanningSceneInterface planning_scene_interface; 

std::vector<double> j_values;
j_values[0] = 0.00;
j_values[1] = -0.80;
j_values[2] = 0.73;
j_values[3] = 0.00;
j_values[4] = 0.755;
j_values[5] = 0.00;

//Motion plan from current location to custom position
moveit::planning_interface::MoveGroup::Plan my_plan;
bool success = group.plan(my_plan);
ROS_INFO("Visualizing Plan %s",success?"":"FAILED");
/* Sleep to give RViz time to visualize the plan. */

moveit_msgs::MoveItErrorCodes error_codes;
if (success == true)
ROS_INFO("Planning To Move");
error_codes = group.move();
ROS_INFO("%d", error_codes.val);

I have used the GUI sliders of the joint state publisher and noted these joint values so I am certain that they are valid positions. The funny part is that sometimes the planning fails and sometimes, even if the planning succeeds and I am able to visualize the trajectory in RViz, the fake trajectory execution fails.

I have also seen this behaviour when I set Pose Goals and Cartesian Path Plan.

I have setup MoveIt without any controllers. I am using the fake_arm_controller. Could this have to do with anything?

Also I was reading about KDL and in some places, it is given that it works for >= 6 DOF arms but in the book Mastering ROS for Robotics Programming on page 404, it is mentioned that KDL works well for DOF > 6.

Which one holds true? Should I start looking into IKFast?

Thanks for your inputs!


This is what I get in the terminal from which I launch my node :

[ INFO] [1482329713.395102382]: Loading robot model 'mitsubishi_rv6sd'...
[ INFO] [1482329713.792179428]: Loading robot model 'mitsubishi_rv6sd'...
[ INFO] [1482329714.748339492]: Ready to take MoveGroup commands for group arm.
[ INFO] [1482329718.508234984]: Visualizing Plan 
[ INFO] [1482329723.508560155]: Planning To Move
[ INFO] [1482329728.544356683]: ABORTED: No motion plan found. No execution attempted.
[ INFO] [1482329728.544465716]: -1
terminate called after throwing an instance of 'class_loader::LibraryUnloadException'
  what():  Attempt to unload library that class_loader is unaware of.
Aborted (core dumped)

and this from the move_group terminal :

[ INFO] [1482329714.751108276]: Planning request received for MoveGroup action. Forwarding to planning pipeline.
[ INFO] [1482329714.784687548]: LBKPIECE1: Starting planning with 1 states already in datastructure
[ INFO] [1482329717.107128883]: LBKPIECE1: Created 184 (156 start + 28 goal) states in 169 cells (151 start (151 on boundary) + 18 goal (18 on boundary))
[ INFO] [1482329717.107195147]: Solution found in 2.333180 seconds
[ INFO] [1482329718.133562849]: SimpleSetup: Path simplification took 1.026287 seconds and changed from 30 to 25 states
[ INFO ...
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You write that "fake trajectory execution fails". Can you tell us how you determine that? Does RViz / MoveIt give you an error, are warnings printed, something else?

gvdhoorn gravatar image gvdhoorn  ( 2016-12-21 09:33:34 -0500 )edit

Yes I get them on my terminal. I will edit the question to include them.

bhavyadoshi26 gravatar image bhavyadoshi26  ( 2016-12-21 09:54:54 -0500 )edit

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answered 2016-12-21 10:22:20 -0500

gvdhoorn gravatar image

From the output it just looks like the planner was unable to find a solution. LBKPIECE might not be a good planner for your problem. Have you tried others? Like RRTConnect?

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I tried planning with RRTconnect and it works. @gvdhoorn What could be the reason LBKPIECE didn't work?

bhavyadoshi26 gravatar image bhavyadoshi26  ( 2016-12-22 08:01:20 -0500 )edit

Without knowing (much) more, that's difficult to say. It could be that your planning problem is just not one that LBKPIECE is suited for, or that some circumstance is making things difficult for it. See also ros-planning/moveit#197.

gvdhoorn gravatar image gvdhoorn  ( 2016-12-23 04:30:45 -0500 )edit

Hello,I maybe meet the same problem,but I don't know how to change the planner from LBKPIECE to RRTConnect.Can you tell me the solution?Thanks!

yyf gravatar image yyf  ( 2017-10-14 22:12:35 -0500 )edit

There are multiple ways to do that. SImplest: use kinetic, we changed the default by now. ad-hoc fix: move_group.setPlannerID("RRTConnectkConfigDefault") config fix: you can add it as the default planner for your config

v4hn gravatar image v4hn  ( 2017-10-15 07:32:12 -0500 )edit

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Asked: 2016-12-21 09:14:16 -0500

Seen: 6,389 times

Last updated: Dec 21 '16