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java.lang.NullPointerException: null	at org.richfaces.renderkit.ExtendedDataTableRenderer.encodeHeaderOrFooterCell(ExtendedDataTableRenderer.java:275)	at org.richfaces.renderkit.ExtendedDataTableRenderer.encodeHeaderOrFooter(ExtendedDataTableRenderer.java:378)	at org.richfaces.renderkit.ExtendedDataTableRenderer.encodeHeader(ExtendedDataTableRenderer.java:466)	at org.richfaces.renderkit.ExtendedDataTableRenderer.doEncodeChildren(ExtendedDataTableRenderer.java:725)