Knowrob reasoning about objects' tutorial error

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Do I need to rosmake knowrob again? I already did that while installing the knowrob system with tutorials. And roscd knowrob? I did it. No difference This is how it is here: ~/rosbuild_ws/stacks/knowrob ~/rosbuild_ws/stacks/knowrob_tutorials/knowrob_basics_tutorial Is something wrong? I first did the "basic knowrob installion" and then "KnowRob system including tutorials".

Oh! Have I made a big, bad blunder by not putting all this in /opt/ros/hydro ?

You shouldn't put things under /opt/ros. If your workspace is set up according to the tutorials, that's fine. roscd knowrob should bring you to the respective folder. Have you rosmade the knowrob_basics_tutorial package?

As I said, I was making a blunder; albeit a different one. Thank you. And hats off for the thesis.

Is this solved? I put the knowrob_basics_tutorial package in /opt/ros/groovy/stacks/ and I still get this error.

As I said in my previous comment, you should NEVER put things in /opt/ros manually, but create a proper workspace in your home directory as described in the tutorials.

If you use both catkin and rosbuild packages, you will need to create a combined workspace as described here.

If you then still have problems, please give details about your system setup (ROS version, Ubuntu version, swipl --version)