Just to be sure, I re-downloaded the nightly in a separate folder and reset the project, but unfortunately, I get the same error :
Information:[helloWorldFlexJS]: Starting Flex compiler: "/Applications/IntelliJ IDEA.app/Contents/jdk/Contents/Home/jre/bin/java" -Dapplication.home=/Users/vincent/development/Apache/flexjs/sdks/0.9.0 -Dfile.encoding=UTF-8 -Djava.awt.headless=true -Duser.language=en -Duser.region=en -Xmx512m -classpath "/Applications/IntelliJ IDEA.app/Contents/plugins/flex/lib/idea-flex-compiler-fix.jar:/Applications/IntelliJ IDEA.app/Contents/plugins/flex/lib/flex-compiler.jar:/Users/vincent/development/Apache/flexjs/sdks/0.9.0/lib/flex-compiler-oem.jar" com.intellij.flex.compiler.FlexCompiler 57530 Information:[helloWorldFlexJS]: mxmlc -load-config=/Users/vincent/Library/Caches/IntelliJIdea2017.2/compile-server/helloworldflexjs_890a8fa1/_temp_/IntelliJ_IDEA/idea-61249F45-DF3F2E04.xml -load-config+=/Users/vincent/development/Apache/flexjs/sdks/0.9.0/ide/IDEA/intellij-config.xml -targets=JSFlex -external-library-path+=/Users/vincent/development/Apache/flexjs/sdks/0.9.0/js/libs/js.swc Information:[helloWorldFlexJS]: unknown error Information:[helloWorldFlexJS]: Compilation failed Information:08/08/2017 20:10 - Compilation completed with 5 errors and 0 warnings in 8s 201ms Error:[helloWorldFlexJS]: : interface method addEventListener in interface IEventDispatcher is implemented with an incompatible signature in class Main Error:[helloWorldFlexJS]: : interface method removeEventListener in interface IEventDispatcher is implemented with an incompatible signature in class Main Error:[helloWorldFlexJS]: : interface method dispatchEvent in interface IEventDispatcher is implemented with an incompatible signature in class Main /Users/vincent/development/After24/lab/helloWorldFlexJS/src/Main.mxml Error:Error:[helloWorldFlexJS]: interface method element in interface IRenderedObject not implemented by class Main Error:Error:[helloWorldFlexJS]: interface method element in interface IInitialViewApplication not implemented by class Main -- View this message in context: http://apache-flex-users.2333346.n4.nabble.com/FlexJS-IDE-integration-tp15638p15657.html Sent from the Apache Flex Users mailing list archive at Nabble.com.