[op25-dev] Attribute Error: 'file_source_sptr' object has no attribute 'set_gain_adjust'

I'm trying to make a OP25 Transmitter with a B200 mini, as in the video. I'm using the same command line as in the video (./dv_tx.py -p p25 --args 'uhd' -t ./1011.dat -r -Q 430137500 -q 1 -gains 'PGA:90 -v 3 -i 400000). I keep receiving the error "Attribute Error: 'file_source_sptr' object has no attribute 'set_gain_adjust'". I'm new to using SDRs and the B200 mini, so I'd appreciate any advice! Thanks!