error Webservice vtiger 7.5. and > PHP8.0

Vtiger 7.5 with PHP 7.4 works fine. Vtiger 7.5 with PHP >8.0 give error:

Web service gives following error:

Warning: Undefined array key "format" in yoursite.com/include/Webservices/Utils.php on line 142

Warning: Undefined array key "format" in yoursite.com/include/Webservices/Utils.php on line 145

Warning: Undefined array key "string" in yoursite.com/include/Webservices/OperationManager.php on line 138

Fatal error: Uncaught Error: Unknown named parameter $query in yoursite.com/include/Webservices/OperationManager.php:152 Stack trace: #0 yoursite.com/webservice.php(134): OperationManager->runOperation() #1 (closed) {main} thrown in yoursite.com/include/Webservices/OperationManager.php on line 152