"Es ist ein Fehler aufgetreten"-Fehler beim Installtool Contao 4.4.54

Hallo zusammen,

kann mir jemand sagen wie ich die Datenbank updaten kann? Irgendwie liegt es an: Syntax error or access violation: 1091 Can't DROP 'pid';

Code:

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[2020-11-02 20:42:25] request.INFO: Matched route "contao_install". {"route":"contao_install","route_parameters":{"_scope":"backend","_token_check":true,"_controller":"Contao\\InstallationBundle\\Controller\\InstallationController::installAction","_route":"contao_install"},"request_uri":"https://harveycom.it/contao/install","method":"GET"} []
[2020-11-02 20:42:25] app.CRITICAL: An exception occurred. {"exception":"[object] (Doctrine\\DBAL\\Exception\\DriverException(code: 0): An exception occurred while executing '\n            ALTER TABLE\n                tl_newsletter_recipients\n            DROP INDEX\n                pid,\n            ADD UNIQUE KEY\n                pid_email (pid, email)\n        ':\n\nSQLSTATE[42000]: Syntax error or access violation: 1091 Can't DROP 'pid'; check that column/key exists at /www/htdocs/w00a567a/contao4/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:128, Doctrine\\DBAL\\Driver\\PDO\\Exception(code: 42000): SQLSTATE[42000]: Syntax error or access violation: 1091 Can't DROP 'pid'; check that column/key exists at /www/htdocs/w00a567a/contao4/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDO/Exception.php:18, PDOException(code: 42000): SQLSTATE[42000]: Syntax error or access violation: 1091 Can't DROP 'pid'; check that column/key exists at /www/htdocs/w00a567a/contao4/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:125)"} []

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Vielen Dank für jeden Tipp,
Carino