java.lang.NullPointerException: This exception has no message.

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at org.apache.xalan.transformer.TransformerImpl.setParameter(
at org.apache.fop.cli.InputHandler.transformTo(
at org.apache.fop.cli.InputHandler.renderTo(
at org.apache.fop.cli.Main.startFOP(
at org.apache.fop.cli.Main.main(

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