how to get bode plot and transfer function from my simulink block?

I have built a simulation block myself and I wanna get it's transfer function and bode plot. So I can easily use PID controller.

I look for some information and it says I can use linear analysis tool. So I'm OK with that and also I know how to set input signal as sine wave.

But when following the instructions, I did get my output information in linear analysis tool and it shows up. However, when I click estimate button, it has error. There is a file attached to show my block.

I wanna know why and is there another way to easily get the transfer function and bode plot from simulink?