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java.lang.NullPointerException: 	at org.apache.xalan.transformer.TransformerImpl.setParameter(TransformerImpl.java:1558)	at org.apache.xalan.transformer.TransformerImpl.setParameter(TransformerImpl.java:1606)	at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:286)	at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:130)	at org.apache.fop.cli.Main.startFOP(Main.java:177)	at org.apache.fop.cli.Main.main(Main.java:208)