I needed to play music in my app built on using ExtJs library. I tried to run samples of ExtJs AIR, created new sample app to run simple things but dont know why these all and many other kinds of error messages are occuring:

Expected identifier, string or number in AIRIntrospector.js

'air.NativeApplication' is null or not an object in ext-air.js

Object expected in ext-air.js

'air.File' is null or not an object in ../extjs/ext-air.js

What is playing with me???