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Several points:

1. ?The .ASY and .MOD need to be in the same folder as the .ASC, not a separate one.
2. It works if you delete UIC. Don't use UIC unless it's essential.
3. You set Trise and Tfall to 0, which is impossible. LTspice uses default values, which may not be suitable. I set them to 0.1?, but they could be bigger if you adjust Ton and Tperiod to allow for them.
   

I'm only using LTSpice at hobby level. I've created a component for bi-di current-sense amplifier INA181 from PSpice model supplied by TI and a little test schematic (/g/LTspice/files/Temp/ina181a1-test.zip). But using an inductor as load simulation stops with "Singular matrix" error. And with a resistor it gets very slow after a while and output looks not as expected. Maybe someone can make this work better.