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

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This exception has no message.
java.lang.NullPointerException:
at java.lang.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:980)
at java.lang.Double.parseDouble(Double.java:220)
at undefined.Calculations.calc(Calculations.java:91)
at undefined.Calculations.(Calculations.java:63)
at undefined.test1.jButton1ActionPerformed(test1.java:148)
at undefined.test1.access$000(test1.java:18)

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