java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at java.io.File.(Unknown Source)
at com.sencha.util.FileUtil.readFile(FileUtil.java:158)
at com.sencha.tools.compiler.jsb.projects.JsbBuilder.processBuild(JsbBuilder.java:29)
at com.sencha.command.build.JsbCommand.execute(JsbCommand.java:15)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at com.sencha.util.MethodInvoker$Arguments.invoke(MethodInvoker.java:175)
at com.sencha.cli.Command.dispatch(Command.java:43)
at com.sencha.cli.Commands.dispatch(Commands.java:64)
at com.sencha.command.Sencha.dispatch(Sencha.java:73)
at com.sencha.command.Sencha.main(Sencha.java:141)

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