Fatal Error by installing Drupal 8

Hello,
I just tried to install Drupal 8.3.6 the first time.
Alter entering the database I got this error:

Fatal error: Interface ‘DrupallocaleStringStorageInterface’ not found in /home/xy210hob/www/home/core/modules/locale/src/StringDatabaseStorage.php on line 10

In the code of “StringDatabaseStorage.php” there is the line:
“use DrupalCoreDatabaseConnection;”

On my Server I there is no Directory “CoreDatabase”.

I would be glad if someone can help me
Irene

Drupal version: 


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