Unable to start debugging. The Silverlight managed debugging package isn’t installed.

If you installed latest version of Silverlight (Silverlight 4), it may break the your current silverlight development environment. After in the Silverlight 4 installation, if you try to debug any Silverlight 3 project, you will get a message from Visual Studio 2008, saying “Unable to start debugging. The Silverlight managed debugging package isn’t installed.”

Unable to start debugging. The Silverlight managed debugging package isn't installed.

Unable to start debugging. The Silverlight managed debugging package isn't installed.

To fix this error, install the Silverlight Developer Run time. You can get it from here : http://go.microsoft.com/fwlink/?LinkID=188039.

This entry was posted in .Net, Silverlight and tagged , , . Bookmark the permalink.

84 Responses to Unable to start debugging. The Silverlight managed debugging package isn’t installed.

  1. Nithya says:

    Thank so much. This solved my issue.!!!

  2. WolveFred says:

    Thanks for this idea, that works. But the problem is that the XAML IDE of Visual Studio 2008 shows then the SL4 definition of user controls (ex: UIElement.AllowDrop), whereas we develop with SL3. So that’s not perfect.

  3. nuno says:

    I lost XAML autocomplete after install the Silverlight Developer Run time :(

  4. Gabriel Brancolini says:

    Download this plug in for Silverlight 4
    http://go.microsoft.com/fwlink/?LinkID=188039

  5. Surendra says:

    Thank you very much

  6. Chris says:

    thank you

  7. Dotnetmatrix says:

    I’ve the same problem but it was not resolved. I’m using vs 2008 sp1
    silverlight 3 sdk and silverlight 4 for the browsers

  8. Lina Manjarres says:

    I have been looking for this unswer all afternoon!! Thanks a lot!!
    It worked perfect!!
    thank you, thank you, thank you!!

  9. Vinay says:

    Thank u very much…

  10. LEO says:

    You saved my time and effort!

    Thank you so much

  11. Kingly says:

    good,thanks

  12. nuh says:

    Thanks Anuraj (: It solved my problem.I ll write this Turkish to my blog.

  13. Naami Mohammed says:

    Thanks.

  14. Leo says:

    Thx a million Anuraj, it solved the problem for me!

  15. asad says:

    thanx alot man !!!!!!!!!!

  16. Thiago says:

    Tks a lot. I should read this article 1 hour ago.

  17. Daniel says:

    Thanks from Brazil dude!! XD

  18. Camena says:

    Thank you for help with this problem!

  19. Darshan says:

    Thanks Anuraj!!!!! God Bless

  20. nuno says:

    My solution:
    - uninstall SL4 Runtime
    - uninstall SL3 Tools for VS2008 SP1
    - install SL3 Runtime (if you have difficulty to find, go to filehippo.com. On Microsoft page, I always get SL4!)
    - install SL3 Tools for VS2008 SP1 again

  21. Navaneethapperumal says:

    Thank you very much! My Problem Solved…

  22. venkatesh says:

    Thanks a lot……….. to Anuraj.P……..
    Bcoz i am struggling for half a day to find the solution….

  23. Mina says:

    thanks a lot, you just saved me ….

  24. Dan says:

    Cancel my prior comment, link works fine.

    I tried this and I still have same problem.
    I have ran:

    1.Silverlight3_Tools.exe
    2. Silverlight_sdk.exe
    and now 3. Silverlight_Developer.exe

    All are from Microsoft and I see no change in my problem. I’m running Visual Studio SP1 on Windows XP if that helps.

    Any thoughts?

  25. Kaushal says:

    Thanks man , its working perfect !! :)

  26. Amit Bhattacharjee says:

    Yeah ! Thanks . It Worked Excellently !

    Many. Many . Thanks.

    Anuraj P.

  27. Anna says:

    Yeah
    what happened to me was that I didn’t get that silverlight tools 4 had included a runtime for us developers, so I installed SDK, tools for visual studio and a user runtime….
    you have to uninstall the user runtime in that case so that visual studio can find your developer runtime….

  28. Nikunj says:

    Hi,
    Thanks a Lot. it solved my problem.

    Hey i am new to silver light. can any one guide me how to learn silver light easily. any links?

  29. Vivek says:

    Thank you it saved my time

  30. Andrey says:

    Thanks a lot :)

  31. fly2hills says:

    You’re a lifesaver. Muchas gracias!!!

  32. Sachin Karche says:

    Thanks..Thanks..Thanks..Thanks..Thanks..Thanks..Thanks..Thanks..Thanks..Thanks..
    I just finding this from 1 hr..installing lot of packages…but didn’t work…
    But after installing this Silverlight_Developer.exe it just work fine……
    U saved my night..thans a looooooooooootttttttttt.

  33. Dnyandev says:

    Thank u very much…..

  34. Karteek kumar says:

    Thank u very much … It solved my issue

  35. Gayathri says:

    Thanks a lot :-) its working…

    • Anuraj P says:

      @Gayathri : Your welcome :)
      Wow you posted the URL as dotnetthoughts :) Interested in writing on dotnetthoughts? Write to me anuraj dot p at dotnetthoughts dot net (no spam)

  36. Satish Kumar says:

    Thank you so much dear. It helps me a lot……..

  37. Parth says:

    it is not working for me …
    It is still giving me the eroor like : Unable to start debugging. The Silverlight managed debugging package isn’t installed.
    can’t understand what to do ??

  38. Jigar says:

    Thank You very much Anuraj for the tip on http://go.microsoft.com/fwlink/?LinkID=188039
    It really helped me very much…

  39. Raman says:

    Thanks Anuraj …your given solution is very helpfull to resolve my debugging problem

  40. vijay says:

    it’s 100% worked on my PC. Thanks for the great solution.

  41. Rajib says:

    Timely help. Thanks a lot.

  42. Anurag Sindhu says:

    Thanks. It helped me to run my SL3 and SL4 applications side-by-side.

  43. Khalad says:

    Thanks. :)

  44. Manikya Mahesh Rali says:

    Thanks :) . This helped me fix the problem

  45. Ganesh says:

    Thanks you very much its help me

  46. Manoj_Dimpu says:

    thanks a lot ……it solved my problem…….now its working

  47. Komal Chandra Gupta says:

    Thanks a lot………..
    Bcoz i am struggling for half a day to find the solution….

  48. Ravi Ranjan Sharma says:

    Thanks you very much Now I am able to work.

  49. Nisar says:

    Thank you, this tip solved my problem

  50. garry says:

    We already know that microsoft always keep on updating and releasing the new version.
    This issue cause because of the old release , so many people were facing the same issue after the couple of days working : )

    Thanks for the valuable solution . Its solved my issues and its working fine.

  51. Ali Murtaza says:

    It solved my problem thanks :)

  52. Kimberly-Jo Fenech says:

    Thanks a lot! :D

  53. rajesh says:

    Thanks dude.

  54. Awais says:

    Thanks

  55. Sarmad says:

    Thanks man worked like a charm

  56. Jitendra says:

    thanks

  57. Ashok says:

    thanks

  58. sachin nikam says:

    Thanks.issue resolved.

  59. Rajkumar Shivaratri says:

    Thanks a lot…..

  60. Rich says:

    Thanks dude……you are awesome

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