You have entered an expression which the inline assembler is unable to interpret as a valid assembly instruction.

program Produce;

  procedure Assembly;
  asm
    adx  eax, 151
  end;

begin
end.
    program Solve;

  procedure Assembly;
  asm
    add  eax, 151
  end;

begin
end.

Examine the offending inline assembly statement and ensure that it conforms to the proper syntax.