Error in inno setup while compilingAnswered

The error is telling you exactly what is wrong. You're setting a variable you haven't defined.

See TurboActivate.iss referenced in the article: Using TurboActivate with Inno Setup

var
  PkeyPage: TInputQueryWizardPage;
  activated: Boolean;
  taHandle: longint;

procedure InitializeWizard;

Thanks! im entirely new to inno script 

I know the code provided in the tutorial is missing data. it seems  that that was not the only identifier missing under Var and I cant find an example of what the identifiers shoul be. any  chance you can help a newbie out, it would be a huge  heres my script starting at the error

var
 PkeyPage: TInputQueryWizardPage;
 activated: Boolean;
 taHandle: longint;
 TA_OK:  longint;
procedure InitializeWizard;
begin
   // create the product key page
   PkeyPage := CreateInputQueryPage(wpWelcome,
       'Type your product key', '',
       'You can find the {#SetupSetting("AppName")} product key in the email we sent you. Activation will register the product key to this computer.');
   PkeyPage.Add('Product Key:', False);
end;

function NextButtonClick(CurPage: Integer): Boolean;
var
 ret: LongInt;
begin

   if CurPage = wpWelcome then begin
       // get the handle for your version GUID
        taHandle := TA_GetHandle(VERSION_GUID);

       // error handling code
       if taHandle = 0 then begin
           MsgBox('Failed to get the TurboActivate handle. Make sure the TurboActivate.dat file is included with your installer and you''re using the correct VersionGUID.', mbError, MB_OK);
           Result := False;
           exit;
       end;

       // after the welcome page, check if we're activated
       ret := TA_IsActivated(taHandle);

       if ret = TA_OK then begin
           activated := true;
       end;
       Result := True;
   end else if CurPage = PkeyPage.ID then begin

       // check if the product key is valid
       ret := TA_CheckAndSavePKey(taHandle, PkeyPage.Values[0], TA_SYSTEM);

       if ret = TA_OK then begin

           // try to activate, show a specific error if it fails
           ret := TA_Activate(taHandle, 0);

           case ret of
             TA_E_PKEY:
               MsgBox('The product key is invalid or there''s no product key.', mbError, MB_OK);
             TA_E_INET:
               MsgBox('Connection to the servers failed.', mbError, MB_OK);
             TA_E_INUSE:
               MsgBox('The product key has already been activated with the maximum number of computers.', mbError, MB_OK);
             TA_E_REVOKED:
               MsgBox('The product key has been revoked.', mbError, MB_OK);
             TA_E_INVALID_HANDLE:
               MsgBox('The handle is not valid. You must set the VersionGUID property.', mbError, MB_OK);
             TA_E_COM:
               MsgBox('CoInitializeEx failed. Re-enable Windows Management Instrumentation (WMI) service. Contact your system admin for more information.', mbError, MB_OK);
             TA_E_ENABLE_NETWORK_ADAPTERS:
               MsgBox('There are network adapters on the system that are disabled and TurboActivate couldn''t read their hardware properties (even after trying and failing to enable the adapters automatically).' + ' Enable the network adapters, re-run the function, and TurboActivate will be able to "remember" the adapters even if the adapters are disabled in the future.', mbError, MB_OK);
             TA_E_EXPIRED:
               MsgBox('Failed because your system date and time settings are incorrect. Fix your date and time settings, restart your computer, and try to activate again.', mbError, MB_OK);
             TA_E_IN_VM:
               MsgBox('Failed to activate because this instance of your program if running inside a virtual machine or hypervisor.', mbError, MB_OK);
             TA_E_INVALID_ARGS:
               MsgBox('The arguments passed to the function are invalid. Double check your logic.', mbError, MB_OK);
             TA_E_KEY_FOR_TURBOFLOAT:
               MsgBox('The product key used is for TurboFloat, not TurboActivate.', mbError, MB_OK);
             TA_E_ACCOUNT_CANCELED:
               MsgBox('Can''t activate because the LimeLM account is cancelled.', mbError, MB_OK); 
             TA_OK: // successful
             begin
               activated := true;
               Result := True
               exit;
             end
             
             else
               MsgBox('Failed to activate. Error code: ' + IntToStr(ret), mbError, MB_OK);
           end;
           Result := False
       end else begin
           MsgBox('You must enter a valid product key. Error code: ' + IntToStr(ret), mbError, MB_OK);
           Result := False;
       end;
   end else
       Result := True;
end;

The best thing to do is just integrate TurboActivate directly in your app. Save yourself a ton of hassle.

The debuggers for installers are hot garbage so it’s often not worth the time to try to write / debug code for them.

If you’re determined to use TA in an installer then start with out pre-written code