a build of rootfs also is needed.
Follow as described:
Make sure you have all latest patches applied to DEL 5.9.3.x and it has to be 126.96.36.199 as of now.
Create a new FULL project with QT support enabled on rootfs
Flash kernel/rootfs onto device.
Create sample QT project , follow http://www.digi.com/support/kbase/kbaseresultdetl?id=3508
This should solve your issue.