Bug 156166 Error occour when previewing attached report in web viewer.
Decription:Error occour when previewing attached report in web viewer. Steps to reproduce: 1.run attached reports in web viewer. Expeceted results: preview properly Actual results: Error occour when previewing the reports in web viewer while it works properly in html and PDF
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/BindingColumnsEvalUtil.java
}
		}
		Iterator itr = this.allAutoBindingExprs.iterator( );
		while ( itr.hasNext( ) )
		{
			BindingColumn bindingColumn = (BindingColumn) itr.next( );
			Object exprValue = evaluateValue( bindingColumn, AUTO_BINDING );
			exprValueMap.put( bindingColumn.columnName, exprValue );
			if ( exprValue instanceof BirtException == false )
				realValueMap.put( bindingColumn.columnName, exprValue );
		}
		saveHelper.doSaveExpr( realValueMap );
		return exprValueMap;
	}
	/**
	 * @param baseExpr
	 * @param exprType
	 * @param valueMap
	 * @throws DataException
	 */
	private Object evaluateValue( BindingColumn bindingColumn, int exprType )
			throws DataException
	{
		Object exprValue = null;
		try
		{
			boolean getValue = false;
			if ( isBasedOnRD == true )
			{
				String columnName = bindingColumn.columnName;