java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at org.apache.pdfbox.pdmodel.PDResources.add(PDResources.java:675)
at org.apache.pdfbox.pdmodel.PDResources.add(PDResources.java:573)
at org.apache.pdfbox.pdmodel.PDPageContentStream.getName(PDPageContentStream.java:964)
at org.apache.pdfbox.pdmodel.PDPageContentStream.setStrokingColor(PDPageContentStream.java:979)
at org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.initializeAppearanceContent(AppearanceGeneratorHelper.java:221)
at org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.setAppearanceValue(AppearanceGeneratorHelper.java:167)
at org.apache.pdfbox.pdmodel.interactive.form.PDTextField.constructAppearances(PDTextField.java:263)
at org.apache.pdfbox.pdmodel.interactive.form.PDTerminalField.applyChange(PDTerminalField.java:228)

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