Rank formula not working

[johnaddisco]

i am trying to rank students based on their total scores stored, say F9 to F20, and print the results in G9 to G20. I began to print the first rank in G9, but it was not working. i got an error. Please, I need your help. Thanks

sample code:
$rankFormula = '=RANK.EQ(F9, $F$9:$F$20, 0)';
$sheet1->setCellValue('G9', $rankFormula);
$sheet1->getCell('G9')->getCalculatedValue();

Error:
Fatal error: Uncaught PhpOffice\PhpSpreadsheet\Calculation\Exception: Sheet1!G9 -> Formula Error: Unexpected , in C:\xampp\htdocs\phpSpreadsheet\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Cell\Cell.php:277 Stack trace: #0 C:\xampp\htdocs\phpSpreadsheet\linksheet.php(31): PhpOffice\PhpSpreadsheet\Cell\Cell->getCalculatedValue() #1 {main} thrown in C:\xampp\htdocs\phpSpreadsheet\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Cell\Cell.php on line 277