Build Android error

Code:

[ERR] [ERR] BUILD FAILED
[ERR] com.sencha.exceptions.ExProcess: stbuild exited with non-zero code : 7
[ERR]   at org.apache.tools.ant.Target.performTasks(Targ
[ERR] et.java:413)

I guess this is something to do with the ANT, but it installed fine and I do have the path in my environment var.

What is the problem?