Error while using webots matlab controller

hello!

im trying to conduct a robot controlller using webots simulater , but i get this error while using matlab

what should i do?

[Olivier Michel]

Please try to use the latest version of Webots R2020a revision 2 (nighlty build) which you can download from https://github.com/cyberbotics/webots/releases and let me know if the problem persists. This new version improves the support for MATLAB in Webots.

[Mohammad Adeeb]

Im already using it , still the same error

[Mohammad Adeeb]

The proplem in the matlab software , i mean the error appears in matlab

[Olivier Michel]

Which version of MATLAB are you using?

[Walter Roberson]

I do not think R2017a had that install add-ons feature.

You could try installing whatever file it is trying to install, and then commenting out that line.

[Mohammad Adeeb]

I dont know which add-on its trying to find or install

[Walter Roberson]

It appears that you have a startup.m file on your MATLAB path that is trying to find the installed add-ons, using a function that did not exist in R2017a. Perhaps you had a newer version installed and somehow the startup.m for it got used. Or perhaps you have a third-party toolbox that has its own startup.m .

Test with using

restoredefaultpath; rehashtoolboxcache; savepath

Then exit and re-enter MATLAB and see if the problem still shows up. If it does then it will be necessary to track down which startup it is doing.

[Mohammad Adeeb]

Ok , thank u for ur effort i will try and then i’ll tell u the result

[Michael Currie]

Hi Mohammad Adeeb,

It seems that Cyberbotics have made new directories in the R2020a version which have not been updated in their header file and matlab launcher file. I fixed this issue on my machine (Windows) by doing the following:

In the launcher.m file (..\Webots\lib\controller\matlab):

• Change each line containing 'lib/matlab' to 'lib/controller/matlab'
• It's lines 15, 23 and 132

In allincludes.h (..\Webots\lib\controller\matlab):

• Change each include path so that it goes back a further directory
• eg: #include "../../../include/controller/c/webots/accelerometer.h"

Should work after that. I'm still receiving errors regarding a remote control library, but I haven't looked into that yet.