I want to get the frequency response of a notch filter circuit in Proteus 7. The simulation gave good result. The hardware implementation also worked fine. When I tried to get the frequency response, error messages came up saying

i) AC analysis is not supported [refering to the oscilloscope]

ii)simulation failed due to simulator errors.

I would like to remind that the simulation worked and the digital oscilloscope showed expected waveform. The error log is attached below.

The schematic looks like this:

I cant figure out my mistake.

Thank you in advance

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