`include "fullAdder.v"

2049990 ERROR - EightBitAdder.v(1,10-1,11) (VERI-1055) incorrect use of predefined macro include. Expected "filename"

2049990 ERROR - fullAdder.v(3,1-33,10) (VERI-1206) overwriting previous definition of module fullAdder

fullAdder adder0(
    .clock      (addClock),
    .a          (a[0]),
    .b          (b[0]),
    .carryIn    (1b'0),
    .sum        (sum0),
    .carryOut   (carry0)
    );

    fullAdder adder1(
    .clock      (addClock),
    .a          (a[1]),
    .b          (b[1]),
    .carryIn    (carry0),
    .sum        (sum1),
    .carryOut   (carry1)
    );
    ...etc