Yes it was.
I managed to fix it by renaming the plugin folder in excel-export-plus\phimind_excel_export_plus.php line 19 from ‘/plugins/phimind_excel_export_plus/…’ to ‘/plugins/excel-export-plus/…’.
It’s right there in the error stack trace:
( ! ) Fatal error: require_once(): Failed opening required ‘C:\xampp181\htdocs/wp-content/plugins\phimind_excel_export_plus\vendors\PHPExcel.php’ (include_path=’.;C:\xampp181\php\PEAR’) in C:\xampp181\htdocs\wp-content\plugins\excel-export-plus\phimind_excel_export_plus.php on line 19
I’ve since deleted the plugin since it’s not what I needed.