[PHPExcel_Exception] 
Maximum 31 characters allowed in sheet title. (0)
/home/n/nvinvi/nvi_201801/public_html/local/php_interface/PHPExcel/PHPExcel/Worksheet.php:456
#0: PHPExcel_Worksheet::checkSheetTitle(string)
	/home/n/nvinvi/nvi_201801/public_html/local/php_interface/PHPExcel/PHPExcel/Worksheet.php:828
#1: PHPExcel_Worksheet->setTitle(string)
	/home/n/nvinvi/nvi_201801/public_html/local/classes/Catalog/CatalogExporter.php:158
#2: Et\Catalog\CatalogExporter->exportSection(array)
	/home/n/nvinvi/nvi_201801/public_html/local/classes/Catalog/CatalogExporter.php:53
#3: Et\Catalog\CatalogExporter->exportSections()
	/home/n/nvinvi/nvi_201801/public_html/local/classes/Catalog/ExportfileController.php:98
#4: Et\Catalog\ExportfileController->generateExportfile()
	/home/n/nvinvi/nvi_201801/public_html/local/classes/Catalog/ExportfileController.php:59
#5: Et\Catalog\ExportfileController->download()
	/home/n/nvinvi/nvi_201801/public_html/catalog/download.php:3