Om, I know what happened, but not sure where fix should go. Compiler or ItemRendererDataBinding.
Once project is built in MemberItemRenderer itemRenderers.MemberItemRenderer.prototype._bindings which contains all bindings. [1] As you can see array has: ["FontAwesomeIconType", "GLASS"], ItemRendererDataBinding analizing this array and searching in MemberItemRenderer field "FontAwesomeIconType" and because it doesn't exists we have this error. Once I've created such field: [Bindable] public function get fontAwesomeGlass():String { return FontAwesomeIconType.GLASS; } <fa:FontAwesomeIcon iconType="{fontAwesomeGlass}" /> ItemRendererDataBinding will find this field and take it's value without the problem. If someone could let me know where fix should go ? [1] https://paste.apache.org/fOli Piotr ----- Apache Flex PMC piotrzarzyck...@gmail.com -- View this message in context: http://apache-flex-development.2333347.n4.nabble.com/FlexJS-Runtime-error-when-setting-a-property-to-a-constant-value-tp57874p57889.html Sent from the Apache Flex Development mailing list archive at Nabble.com.