Why can`t I use the PID block anymore?

Upon restartin my Simulink model, I get the warning (5 times, 1 time for every PID-block)

Attempt to load model file 'C:\Program Files\MATLAB\R2018b\toolbox\simulink\blocks\library\simulink.slx' recursively

It seems that the file PID no longer exists on my computer.

Could this be the case?

If so, how could I replace it?

Thanks in advance