Co-Simulation - Simulink, gazebo: Error evaluating 'MaskDialog'

Hi,

I am currently working on a Co-Simulation Simulink/Gazebo. When opening only a simple robot, the topics can be chosen within the Simulink-Block (Gazebo Read).

Opening some custom world and the robot, it throws the following error:

"Error evaluating 'MaskDialog' callback of Gazebo Read block (mask) 'untitled/Gazebo Read2'. Callback string is 'robotics.slgazebo.internal.block.GazeboReadBlockMask.dispatch('topicSelect', gcb);' STD exception 'mwboost::exception_detail::clone_impl': 'std::exception' was caught."

Any advice? Thanks.

[Gaurav Bhosale]

Hi Eric,

I have few questions. Can you please provide me more details?

Which MATLAB version you using ? Also, are facing this issue for all Gazebo blocks or just Gazebo Read block ? Further did you install latest MATLAB update ?

Further, there are some suggestions from similar post. Have you checked this?

https://www.mathworks.com/matlabcentral/answers/450518-caught-std-exception-exception-message

https://www.mathworks.com/matlabcentral/answers/504980-why-do-i-get-a-bundle-error-message-after-updating-matlab

Thanks

[JAEYONG HAN]

Hi, I am the Eric's colleague. I am the one actually facing the problem.

I am using MATLAB 2021a and Gazebo 9.

The error occurs for all Gazebo blocks, not only Gazebo read block.

when I click the "select" in the figure to select the topic that I want to read.

Note that, this error occurs only with certain "world" file.

Will it be better if I upload the world file?

Thanks

[Gaurav Bhosale]

Hi Jaeyong,

Okay. Are you using different .world file?

If you use shipped VM ( https://www.mathworks.com/support/product/robotics/ros2-vm-installation-instructions-v4.html ) and launch world for this VM, then you are facing same issue?

If possible, please attach .world file.

Thanks

[JAEYONG HAN]

Thank you for your answer,

I dont use VM.

I attached .world.files.

There are two

one named "test_only_with_the_car" which has no problem to select the topic in Gazebo Read block,

another named "The_RC_Car_World" which has a road, and the care above. when I open this world files, I run into the error, when I try to select the topic in Gazebo Read block.

I am not sure if only the world file is good enought for you,.

Thanks

Jaeyong

Answer 1

[Gaurav Bhosale]

Hi Jaeyong,

I checked both .world files and saw issue in The_RC_Car_World.world

I found that, in the The_RC_Car_World.world file, the model names contains some special character which is not understood by API.

One of place of special character I am showing below.

Avoid above 'ß' character in .world file. This is not readable by API.

Further, when I removed this character, updated my .world file and run Simulink model then I am able to see topics as,

So, remove the above mentioned character, each and every place from .world file. You will able to get topics.

Let me know, if stil you find any issue.

Thanks

Gaurav Bhosale

[JAEYONG HAN]

HI, Gaurav

Thanks a lot, I can now select the topic without any problem!

It was a German character. Now I know that the German alphabet should not be used.

Thank you again,

Jaeyong