Ambiguous overloaded call to ...

I'm trying to write an overloaded function that can return data as different types. Basically the function I will altimately be calling will return a string, hoever I want to write a wrapper around this so that I can get results in other types (Integer, real, etc..)

Heres my example.. When I try to compile this, I get "Ambiguous overloaded call to 'DBGetValue'.. What am I doing wrong here?

function DBGetValue(Module,Key:String):String; overload;
begin
  Result := '12345';
end;

function DBGetValue(Module,Key:String; const Default:Integer = 0): Integer; overload;
var s:String;
begin
  try
    s      := DBGetValue(Module,Key);
    Result := StrToInt(s);
      except
      Result := Default;
    end;
end;