Error on the Log

2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] Impossible to load class UConverter<br/> => Not found in ../model/custom/UConverter.php <br/> => Not found in ../model/UConverter.php <br/> => Not found in ../model/persistence/UConverter.php <br/>
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] === Trace Stack for last error ===
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] => /var/www/projeqtor/prod/tool/projeqtor.php at line 1817 calling debugPrintTraceStack()
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] => calling projeqtorAutoload()
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] => /var/www/projeqtor/prod/external/HtmlPhpExcel/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/StringHelper.php at line 337 calling class_exists()
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] => /var/www/projeqtor/prod/external/HtmlPhpExcel/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Cell/DefaultValueBinder.php at line 23 calling PhpOffice\PhpSpreadsheet\Shared\StringHelper:sanitizeUTF8()
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] => /var/www/projeqtor/prod/external/HtmlPhpExcel/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Cell/Cell.php at line 193 calling PhpOffice\PhpSpreadsheet\Cell\DefaultValueBinder:bindValue()
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] => /var/www/projeqtor/prod/external/HtmlPhpExcel/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/Worksheet.php at line 1144 calling PhpOffice\PhpSpreadsheet\Cell\Cell:setValue()
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] => /var/www/projeqtor/prod/external/HtmlPhpExcel/vendor/ticketpark/htmlphpexcel/lib/HtmlPhpExcel/HtmlPhpExcel.php at line 217 calling PhpOffice\PhpSpreadsheet\Worksheet\Worksheet:setCellValue()
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] => /var/www/projeqtor/prod/external/HtmlPhpExcel/vendor/ticketpark/htmlphpexcel/lib/HtmlPhpExcel/HtmlPhpExcel.php at line 104 calling Ticketpark\HtmlPhpExcel\HtmlPhpExcel:createExcel()
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] => /var/www/projeqtor/prod/view/print.php at line 389 calling Ticketpark\HtmlPhpExcel\HtmlPhpExcel:process()
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] => /var/www/projeqtor/prod/view/print.php at line 312 calling finalizePrint()
2024-10-02 14:24:45.991 ***** ERROR ***** [V11.3.2] ===