This error message results when the compiler expected two types to be compatible (or similar), but they turned out to be different.

program Produce;

procedure Proc(I: Integer);
begin
end;

begin
  Proc( 22 / 7 ); (*Result of / operator is Real*)
end.

Here a C++ programmer thought the division operator / would give him an integral result - not the case in Delphi.

program Solve;

procedure Proc(I: Integer);
begin
end;

begin
  Proc( 22 div 7 ); (*The div operator gives result type Integer*)
end.

The solution in this case is to use the integral division operator div - in general, you have to look at your program very careful to decide how to resolve type incompatibilities.