I was having the same error. I deleted the FlexJS SDK and installed a new FlexJS Nightly Build using the Installer and it now works. Maybe you installed an older one. The fix was only available about an hour ago.
-Alex On 10/29/15, 10:17 PM, "lizhi" <s...@qq.com> wrote: >it is must a bug.i have install it 2.at my home,and at my comp. > >the same error > >[java] Could not find file for class: >org.apache.flex.collections.ArrayList > > > >-- >View this message in context: >http://apache-flex-development.2333347.n4.nabble.com/flexjs-0-5-build-erro >r-tp49725p49729.html >Sent from the Apache Flex Development mailing list archive at Nabble.com.