Delphi RAD Studio 10.2 Error reading Form1.FormFactor.Width Property FormFactor.Width does not exist

Question

I have one problem with RAD Studio 10.2 for old version XE5 it worked ok. It gives an exception error:

"Error reading Form1.FormFactor.Width Property FormFactor.Width does not exist"

when I try to open my main form.

unit FormEmail;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
  FMX.Types, FMX.Graphics, FMX.Controls, FMX.Forms, FMX.Dialogs, FMX.StdCtrls,
  FMX.Edit, IdMessage, IdBaseComponent, IdComponent, IdTCPConnection,
  IdTCPClient, IdExplicitTLSClientServerBase, IdMessageClient, IdSMTPBase,
  IdSMTP, System.StrUtils,IdSSLOpenSSL, FMX.Controls.Presentation, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.Menus, Vcl.StdCtrls, Vcl.ComCtrls;

You are mixing firemonkey FMX units with VCL units. You can't use both. — LU RD
@LURD I think that this is a trap a few newbies might fall into. I think it is worth putting your comment up as an answer. — Dsm

LU RD LU RD · Accepted Answer · 2017-10-02T10:01:56

You are mixing firemonkey FMX units with VCL units. They can't coexist.

Remove the VCL units from your uses in the FormEmail unit, and your code will compile.

Delphi RAD Studio 10.2 Error reading Form1.FormFactor.Width Property FormFactor.Width does not exist

1 Answers