This means that although you say you have dropped all the Alfresco tables, you are still connecting to an existing Alfresco database schema. You can only get this error if the database has records that refer to content.
Check your database connection details
Check you are using a clean i.e. empty alf_data directory (according to your log this should be: C:\alfresco\alf_data)
Drop and recreate the Alfresco database.
Check your database connection details again and check the database is created but empty
Start your server
Content from pre 2016 and from language groups that have been closed.
Content is read-only.
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