how can i solve this error ?

2021 8 25
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更新时间：2021 8 25
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mohamed saber
mohamed saber 2021-8-25
Error evaluating 'OpenFcn' callback of World Frame block (mask) 'Final_light_assembly_URDF/World'. Callback string is 'simmechanics.sli.internal.block_dialog(gcbh,'open');'
Unable to write file /home/saber/.matlab/R2018b/matlabprefs.mat: permission denied.
Walter Roberson
Walter Roberson 2021-8-25 
! chmod u+rw /home/saber/.matlab/R2018b/matlabprefs.mat

If it says permission denied for that then possibly you are not the owner of the file. You might need to delete the file if you can, or get an administrator to delete it.

mohamed saber
mohamed saber 2021-8-25
I found the solution :
cd ~/.matlab
sudo chmod a+w -R R2018a/

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