Delphi XE2 Does not recognise SysUtils in a DLL

I am tryin gto write a DLL using Delphi XE2.

The uses clause contain
  SysUtils, Classes, Dialogs;

The Dialogs statement is not recognised by Delphi.  Moving the mouse over Dialogs, generates a hint "Cannot resolve unit name 'Dialogs'.

On compiling the following Error is generated.
[dcc32 Fatal Error] SIDDLLLib.dpr(14): F1026 File not found: 'C:\Site Designer IV\DLLLib\Dialogs.dcu'

Adding FMX.Dialogs  gets a perfect compile but calling the DLL from my main program, generates the Error:
Access violation at address 01974FA7 in module 'MyTestDLL.dll'.  Write of address 00000000.

Can anyone direct me in the right direction, please.
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David KrollCommented:
In XE2, it should be Vcl.Dialogs.  Also System.SysUtils.

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HenryM2Author Commented:
Thanks, Vcl.Dialogs works.  I initially tried System.SysUtils but it did not work.
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