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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:437)	at org.pdfclown.documents.contents.fonts.SimpleFont.onLoad(SimpleFont.java:139)	at org.pdfclown.documents.contents.fonts.Font.load(Font.java:737)	at org.pdfclown.documents.contents.fonts.Font.(Font.java:351)	at org.pdfclown.documents.contents.fonts.SimpleFont.(SimpleFont.java:62)	at org.pdfclown.documents.contents.fonts.TrueTypeFont.(TrueTypeFont.java:69)	at org.pdfclown.documents.contents.fonts.Font.wrap(Font.java:253)	at org.pdfclown.documents.contents.FontResources.wrap(FontResources.java:64)	at org.pdfclown.documents.contents.FontResources.wrap(FontResources.java:40)	at org.pdfclown.documents.contents.ResourceItems.get(ResourceItems.java:158)	at org.pdfclown.documents.interaction.forms.TextField.refreshAppearance(TextField.java:327)	at org.pdfclown.documents.interaction.forms.TextField.setValue(TextField.java:218)	at FillForm.fillForm(FillForm.java:38)	at FillForm.main(FillForm.java:59)