MATLAB might be unable to resolve the default path. The following link might be helpful:
For Simulink users, including an additional command may be helpful:
>> restoredefaultpath
>> rehash toolboxcache
>> sl_refresh_customizations
After this step, please use MATLAB/ Simulink to see if the issue occurs again. If the issue is resolved, then you may want to save the new MATLAB search path by executing the following command:
>> savepath
NOTE: This will remove any custom paths you may have created.