java.lang.NullPointerException

Stack Overflow | kevinxia | 2 months ago
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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at org.knowm.xchart.XChartPanel.<init>()
    2. org.knowm.xchart
      XChartPanel.<init>
      1. org.knowm.xchart.XChartPanel.<init>(XChartPanel.java:65)
      1 frame
    3. Unknown
      testMain$1.actionPerformed
      1. testMain$1.actionPerformed(testMain.java:78)
      1 frame