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Home/ Questions/Q 7606729
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Editorial Team
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Editorial Team
Asked: May 31, 20262026-05-31T00:28:56+00:00 2026-05-31T00:28:56+00:00

I recently started developing mobile applications using Flex 4.5. I try to migrate an

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I recently started developing mobile applications using Flex 4.5. I try to migrate an web application done flex 3 to flex 4.5 the following error shown.

Definition mx.core:Container could not be found.

What we can use instead of this in flex 4.5 mobile application. Please help me.

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  1. Editorial Team
    Editorial Team
    2026-05-31T00:28:57+00:00Added an answer on May 31, 2026 at 12:28 am

    look at this http://flashcongress.cn/devnet/flex/articles/migrating-flex-apps-part3.html

    please check this

    “Flex Build Path” -> “Library Path” -> “Component set:” to “Spark only”

    if your settings is as above then change them to

    “Flex Build Path” -> “Library Path” -> “Component set:” to “MX + Spark”

    this will solve the problem

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