Type 3 compensator design
The op-amp must be biased so that it does not rail up or down. It means the 12-V source should not be 12 V but slightly less or more, depending on the open-loop gain of the op-amp. You can easily add an auto-bias circuit as shown in the below template:

You set the op-amp output to 2.5 V for instance (far from the min or the max output) and the E1 source auto-biases the divider network, ensuring a correct operation in the linear zone of the op-amp.