Launch Failed!

If the program is already running, close it before attempting to run.

I don’t know how many times I have gotten this error message while trying to Run a project in Adobe Flash Builder.

For all of you stuck with this message and unable to ever get your projects going, there is quite a simple fix to this.

All you need to do is open up Task Manager (Ctrl+Shift+Esc) and click on Processes, then “End Process” on any instances of “adl.exe” you find. Only one adl.exe instance can run at any given time.

ADL.exe stands for “Adobe AIR Debug Launcher” and is run everytime you try and compile/run a project in Flash Builder.


Johan Nyberg · October 25, 2011 at 07:22

Thank you so much! I too was in the “vortex of insanity” (loved that expression Ben 🙂

Carlos · September 27, 2011 at 18:03

La respuesta de Underke es la mas corta y la mejor, Gracias…..

Rajesh Panchal · July 15, 2011 at 14:17

thank you very much… 🙂

    sake1 · July 30, 2011 at 22:52


    I’m trying to create an AIR application in Flex Builder 4.5. I have Windows 7 prof 64 bit PL.
    I’m Making run app and nothing appears no application window as I will next run the second time I have a message.

    “if the program is already running, close it before attempting to run.”

    After running in task manager process is running ADL.exe and when call it again in a flash builder, next shown info this in the message.

    I was looking at various forums but all solutions have failed.
    Please help.

vkwave · April 21, 2011 at 10:06

Many thanks for sharing that solution. I was fighting for that issue. Finally got solution.

Tony · January 18, 2011 at 18:27

Thank you all! You saved the life of my machine. It too was about to get airborne.

Best Regards,

Andrew · December 19, 2010 at 15:30

@Underke, Thanks for posting this answer, very useful indeed!!

    x · August 15, 2011 at 22:26

    Thank you Underke!!!!!!!!!!!!!!!!!!!!!!!!!

Underke · December 17, 2010 at 16:11

4. Also make sure you have the correct tags for your application,. mine needed to be WindowedApplication instead of Application.

    Rajesh Panchal · July 15, 2011 at 14:11

    Underke, Thanks a lot… i was stuck with this error and after reading this much comment with the same issue. i found the solution(coz of you only). this makes me happy now. so thank you so much…………. 🙂 🙂 !!!!!!!

Underke · December 17, 2010 at 13:44

Well I did some more google searching and since this one came up as my first hit,.. I think I should post the answer here.

1. try to delete the process adl.exe as above
2. try restart your flash builder
3. if all fails! the project got corrupted.
-> Copy your project folder and create a new project. (after all works delete the old one).

Fletch · October 13, 2010 at 11:10

Which came out better, the machine or the wall?

Bonnie Estrada · September 15, 2010 at 22:13

Add me to the insanity list. I’ve rebooted, restarted Flash Builder (sdk 3.5), removed the adl.exe from the task manager (in many different sequences) and I’m still getting the same message. “If the program is already running, close it before attempting to run.”

Ben · September 2, 2010 at 17:38

@Lewis – my sentiments exactly, it’s somewhat comforting to know I’m not the only one left in a vortex of instanity by these tools.

Lewis Evans · August 31, 2010 at 15:03

I too have this problem but nothing I do will resolve it. I have even rebooted. I’m going to throw my machine at the wall soon unless I can get this sorted.

Please help!

Andrew · June 17, 2010 at 09:40

@Jason, I too have experienced this, not entirely sure why it thinks it is still running when it isn’t.
I think it stores the identifier to the instance in app memory then refers back to that each time.
It resolves for me if I restart the program.
Not the most ideal solution, but when nothing else really works 100%, what other choice do we really have?
If you find anything else, do let me know!

Jason · June 12, 2010 at 20:40

I’m having this same issue, but I get it even when adl.exe is not previously open. Then I have to close that process, and if I try again, it opens the adl.exe process and gives me that same error even though the app wasn’t already open. Any idea why?

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