java.lang.NullPointerException

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    • java.lang.NullPointerException at java.lang.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:980) at java.lang.Double.parseDouble(Double.java:220) at Calculations.calc(Calculations.java:91) at Calculations.<init>(Calculations.java:63) at test1.jButton1ActionPerformed(test1.java:148) at test1.access$000(test1.java:18)

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