Without knowing too much about this, maybe try to build without FB? Also, have you seen this [1]?
[1] https://stackoverflow.com/questions/32755390/unable-to-add-include-ane-file-in-ant-script -- View this message in context: http://apache-flex-users.2333346.n4.nabble.com/java-lang-NullPointerException-Error-in-Flash-Builder-tp15353p15365.html Sent from the Apache Flex Users mailing list archive at Nabble.com.
