mxmlc error: IllegalArgumentException

hello

I am working on migrating Adobe Flex project to Javascript. I installed the binary version of Apache Royale. I tried running the mxmlc on one of my .mxml file. It gave me error
Internal error: java.lang.IllegalArgumentException: expected one element but was: com.google.common.collect.Iterators.getOnlyElement(Iterators.java:316)com.google.common.collect.Iterables.getOnlyElement(Iterables.java:254)org.apache.royale.compiler.clients.MXMLJSCRoyale.setupTargetFile(MXMLJSCRoyale.java:1009)org.apache.royale.compiler.clients.MXMLJSCRoyale.compile(MXMLJSCRoyale.java:329)org.apache.royale.compiler.clients.MXMLJSCRoyale._mainNoExit(MXMLJSCRoyale.java:265)org.apache.royale.compiler.clients.MXMLJSCRoyale.mainNoExit(MXMLJSCRoyale.java:222)org.apache.royale.compiler.clients.MXMLJSC._mainNoExit(MXMLJSC.java:369)org.apache.royale.compiler.clients.MXMLJSC.mainNoExit(MXMLJSC.java:304)org.apache.royale.compiler.clients.MXMLJSC.staticMainNoExit(MXMLJSC.java:262)org.apache.royale.compiler.clients.MXMLJSC.main(MXMLJSC.java:244)

Can anyone please help/guide.
I appreciate any help on this.

Thank you,
Nitin Kanaskar