Simulating the input of a piezoelectric sensor

Hello
I simulated a charge-to-voltage converter circuit that consists of a series of filters and an amplifier.

The input of this circuit is a piezoelectric sensor and it is a load. And since the input is floating in the first floor, after removing the unwanted frequencies in the direction of frequency interference, a protective amplifier is used.

Regarding how to connect the input of the current source to the circuit, it gives a problem and a floating point error