Everything was working all of a sudden the below error shows up :

[ INFO] [1636693505.721342602]: Finished loading Gazebo ROS API Plugin. [ INFO] [1636693505.722001556]: waitForService: Service [/gazebo/setphysicsproperties] has not been advertised, waiting... terminate called after throwing an instance of 'boost::exceptiondetail::cloneimplboost::exception_detail::error_info_injector<boost::lock_error >' terminate called recursively what(): boost: mutex lock failed in pthreadmutexlock: Invalid argument

When I restarted my PC the above-mentioned error went away but the gazebo is unable to load the models which was happening earlier before the error which I mentioned occurred.