I'm getting a strange error when using two Verilog-A blocks (pic attached) together.  I test each block on their own and they work fine.  When I try to use them together though, I get this error:

"ERROR (CMI-2116): I3: Too few terminals given (3 < 4)"

The first block ("min_block") takes three voltages and finds the minimum.

The second block ("subtract_block") takes two voltages and outputs the difference.

My Verilog-A for the min_block is:

"`include "constants.vams"
`include "disciplines.vams"

module min_block(x, y, z, out);
     electrical x, y, z, out;

     analog begin : themodule
           real vx,vy,vz;
           real temp, temp2;
           vx = V(x);
           vy = V(y);
           vz = V(z);

           temp = min(vx,vy);
           temp2 = min(temp,vz);
           V(out) <+ temp2;
     end
endmodule"

And my code for the subtract_block is:

`include "constants.vams"
`include "disciplines.vams"

module min_block(x, y, difference);
     electrical x, y, difference;

     analog begin : themodule
           real vx,vy;
           real temp;
           vx = V(x);
           vy = V(y);

           temp = (vx - vy);
           V(difference) <+ temp;
     end
endmodule