java.lang.IllegalArgumentException: This Style does not belong to the supplied Workbook. Are you trying to assign a style from one workbook to the cell of a differnt workbook?
	at org.apache.poi.hssf.usermodel.HSSFCellStyle.verifyBelongsToWorkbook(HSSFCellStyle.java:801)
	at org.apache.poi.hssf.usermodel.HSSFCell.setCellStyle(HSSFCell.java:898)
	at org.apache.poi.hssf.usermodel.HSSFCell.setCellStyle(HSSFCell.java:894)
	at org.openmrs.module.reporting.common.ExcelUtil.setStyle(ExcelUtil.java:228)
	at org.openmrs.module.reporting.common.ExcelBuilder.addCell(ExcelBuilder.java:98)
	at org.openmrs.module.reporting.common.ExcelBuilderTest.shouldSupportMoreThan4000StyledCells(ExcelBuilderTest.java:63)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
(26 more lines...)

java.lang.IllegalArgumentException: This Style does not belong to the supplied Workbook. Are you trying to assign a style from one workbook to the cell of a differnt workbook?
	at org.apache.poi.hssf.usermodel.HSSFCellStyle.verifyBelongsToWorkbook(HSSFCellStyle.java:801)
	at org.apache.poi.hssf.usermodel.HSSFCell.setCellStyle(HSSFCell.java:898)
	at org.apache.poi.hssf.usermodel.HSSFCell.setCellStyle(HSSFCell.java:894)
	at org.openmrs.module.reporting.common.ExcelUtil.setStyle(ExcelUtil.java:228)
	at org.openmrs.module.reporting.common.ExcelUtilTest.shouldAddStyle(ExcelUtilTest.java:82)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
(25 more lines...)

java.lang.IllegalArgumentException: This Style does not belong to the supplied Workbook. Are you trying to assign a style from one workbook to the cell of a differnt workbook?
	at org.apache.poi.hssf.usermodel.HSSFCellStyle.verifyBelongsToWorkbook(HSSFCellStyle.java:801)
	at org.apache.poi.hssf.usermodel.HSSFCell.setCellStyle(HSSFCell.java:898)
	at org.apache.poi.hssf.usermodel.HSSFCell.setCellStyle(HSSFCell.java:894)
	at org.openmrs.module.reporting.common.ExcelUtil.setStyle(ExcelUtil.java:228)
	at org.openmrs.module.reporting.common.ExcelBuilder.addCell(ExcelBuilder.java:98)
	at org.openmrs.module.reporting.report.renderer.CohortDetailReportRenderer.render(CohortDetailReportRenderer.java:177)
	at org.openmrs.module.reporting.report.renderer.CohortDetailReportRendererTest.shouldRenderIndicatorsWithDifferentDatasets(CohortDetailReportRendererTest.java:130)
(27 more lines...)