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Warning: Undefined variable $Notes in /mnt/web312/b2/57/59271857/htdocs/musiklehre-fuer-gitarre/books/Musiklehre-Fuer-Gitarre/2/22/227-228/NoteIdentificationGitarre.php on line 235
Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in /mnt/web312/b2/57/59271857/htdocs/musiklehre-fuer-gitarre/books/Musiklehre-Fuer-Gitarre/2/22/227-228/NoteIdentificationGitarre.php:235
Stack trace:
#0 /mnt/web312/b2/57/59271857/htdocs/musiklehre-fuer-gitarre/books/Musiklehre-Fuer-Gitarre/2/22/227-228/NoteIdentificationGitarre.php(235): array_keys(NULL)
#1 /mnt/web312/b2/57/59271857/htdocs/musiklehre-fuer-gitarre/books/Musiklehre-Fuer-Gitarre/2/22/227-228/228.php(3): include('/mnt/web312/b2/...')
#2 /mnt/web312/b2/57/59271857/htdocs/musiklehre-fuer-gitarre/subforms/Book.inc.php(57): include('/mnt/web312/b2/...')
#3 /mnt/web312/b2/57/59271857/htdocs/musiklehre-fuer-gitarre/Index.php(88): include('/mnt/web312/b2/...')
#4 {main}
thrown in /mnt/web312/b2/57/59271857/htdocs/musiklehre-fuer-gitarre/books/Musiklehre-Fuer-Gitarre/2/22/227-228/NoteIdentificationGitarre.php on line 235
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