Just check the publish path, both of the SWF and the IPA you are creating. It's not enough to leave them how they area. Click on the browse icon and specifically point to a location to output.

The only time I get that error is when a file is in use (or Windows thinks it is) because it's either launched or selected in a Windows Explorer, then you'll fail to compile the SWF itself. Otherwise not hitting browse and specifically setting the path to export to also produces that error for me.

Is any SWF being generated? If so, does it have a size (>0kb)?

One thing you should definitely do is overlay the latest Adobe AIR over Flash CS5.5. This will assure you have all the latest fixes and updates to AIR for iOS. This may solve your issue.

Download the SDK here:

http://www.adobe.com/devnet/air/air-sdk-download.html

Instructions on overlaying (disregard the version number difference, just use the correct number for the AIR you're overlaying instead, from 13 to 16):

http://helpx.adobe.com/x-productkb/multi/overlay-air-sdk-flash-profess ional.html

I would also recommend you download and update Flash CS5.5 to have the latest Flash Player. This is so you can target and test using version 16 (flash player 11.3). Here's the download page for the latest Flash Player Debuggers, playerglobal.swc, etc.:

http://www.adobe.com/support/flashplayer/downloads.html

There's not a lot of information out there on how to install this into Flash CS5.5 but I'll give you the general jist:

- Close Flash Pro

 

- Install the 2 browser plugins (activeX and plugin based debuggers)

 

- Download the "Projector Content Debugger" and overwrite the FlashPlayerDebugger.exe in this default path: C:\Program Files (x86)\Adobe\Adobe Flash CS5.5\Players\Debug

 

- Download the "Projector" and overwrite the FlashPlayer.exe in this default path: C:\Program Files (x86)\Adobe\Adobe Flash CS5.5\Players\Release

 

- Download the playerglobal.swc (make sure it's named exactly that), then navigate to this default path: C:\Program Files (x86)\Adobe\Adobe Flash CS5.5\Common\Configuration\ActionScript 3.0

 

- Make a folder in that path called "FP11.3" and place the playerglobal.swc in there.

 

- Navigate to the default folder C:\Program Files (x86)\Adobe\Adobe Flash CS5.5\Common\Configuration\Players

 

- Duplicate the latest FlashPlayer1x_x.xml file and name it FlashPlayer11_3.xml.

 

- Edit the file. Change the lines to reflect this, bolded parts are the changes:

 

<player id="FlashPlayer11.3" version="16" asversion="3">

 

<name>Flash Player 11.3</name>

 

<playerDefinitionPath as2="$(UserConfig)/Classes/FP10;$(UserConfig)/Classes/FP9;$(UserConfi g)/Classes/FP8;$(UserConfig)/Classes/FP7" as3="$(AppConfig)/ActionScript 3.0/FP11.3/playerglobal.swc" />

Now you can restart flash and in your publish target you should see Flash Player 11.3 as a target.

To verify 11.3 is installed correct open a new AS3 document and paste this code and then run it using the DEBUGGER.

Don't just hit CTRL+ENTER, that's just a player. Use CTRL+SHIFT+ENTER. You should see version 11 being traced now.

Here's the simple frame script code:

import flash.system.Capabilities;

trace(Capabilities.version);

For me using the debugger (CTRL+SHIFT+ENTER) I see: WIN 11,3,300,257

For me using just release (CTRL+ENTER): WIN 10,2,153,2