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

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java.lang.NullPointerException:
at sun.tools.java.Environment.error(Environment.java:854)
at sun.tools.java.Environment.error(Environment.java:866)
at sun.tools.java.Scanner.scanString(Scanner.java:814)
at sun.tools.java.Scanner.xscan(Scanner.java:1029)
at sun.tools.java.Scanner.scan(Scanner.java:963)
at undefined.JavaContext$JavaView.updateScanner(JavaContext.java:235)
at javax.swing.text.WrappedPlainView.drawText(WrappedPlainView.java:124)
at javax.swing.text.WrappedPlainView.drawLine(WrappedPlainView.java:95)
at javax.swing.text.WrappedPlainView$WrappedLine.paint(WrappedPlainView.java:593)
at javax.swing.text.BoxView.paintChild(BoxView.java:144)
at javax.swing.text.BoxView.paint(BoxView.java:407)
at javax.swing.text.WrappedPlainView.paint(WrappedPlainView.java:349)
at undefined.JavaContext$JavaView.paint(JavaContext.java:174)

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