org.mozilla.javascript.EcmaError: TypeError: Cannot read property "x" from undefined (app://examples/bas ic_animation.js#28)

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org.mozilla.javascript.EcmaError: TypeError: Cannot read property "x" from undefined (app://examples/bas
                                  ic_animation.js#28)	at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3784)	at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3762)	at org.mozilla.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3790)	at org.mozilla.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3809)	at org.mozilla.javascript.ScriptRuntime.undefReadError(ScriptRuntime.java:3822)	at org.mozilla.javascript.ScriptRuntime.getObjectProp(ScriptRuntime.java:1507)	at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:1398)