This is what was in my error.log
[10-May-2018 01:17:26 UTC] PHP Fatal error: Uncaught Error: Call to undefined function mb_strtolower() in /home/eddies/public_html/wp-content/plugins/woo-order-export-lite/classes/PHPExcel/Style/NumberFormat.php:448
Stack trace:
#0 [internal function]: PHPExcel_Style_NumberFormat::setLowercaseCallback(Array)
#1 /home/eddies/public_html/wp-content/plugins/woo-order-export-lite/classes/PHPExcel/Style/NumberFormat.php(464): preg_replace_callback(‘/(?:^|”)([^”]*)…’, Array, ‘yyyy-mm-dd hh:m…’)
#2 /home/eddies/public_html/wp-content/plugins/woo-order-export-lite/classes/PHPExcel/Style/NumberFormat.php(647): PHPExcel_Style_NumberFormat::formatAsDate(43120.6978125, ‘yyyy-mm-dd hh:m…’)
#3 /home/eddies/public_html/wp-content/plugins/woo-order-export-lite/classes/PHPExcel/Worksheet.php(738): PHPExcel_Style_NumberFormat::toFormattedString(43120.6978125, ‘yyyy-mm-dd hh:m…’)
#4 /home/eddies/public_html/wp-content/plugins/woo-order-export-lite/classes/formats/class-woe-formatter-xls.php(154): PHPExcel_Worksheet->calculateColumnWidths()
#5 /home/edwa in /home/eddies/public_html/wp-content/plugins/woo-order-export-lite/classes/PHPExcel/Style/NumberFormat.php on line 448
hi
You must install multibyte string PHP extension
or should use CSV format.
thanks, Alex