Webserver is wrong configured - wrong document root
Please adjust the settings of the web server. If the service is operated on a Plesk system, you will find these settings in the Hosting Settings under Document root.
Here are examples of development, test and productive environments:
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httpdocs/dev/o/public
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httpdocs/dev/s/public
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httpdocs/dev/m/public
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httpdocs/beta/public
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httpdocs/test/public
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httpdocs/public/public
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httpdocs/prod/public