Notice: Undefined index: chooseTeacher in C:\web\Apache24\htdocs\www\Distant\Demo\El_library\html\WorkWithMistake.php on line 3

Notice: Undefined variable: GetListGroup in C:\web\Apache24\htdocs\www\Distant\Demo\El_library\html\WorkWithMistake.php on line 18

Warning: file_get_contents(): Filename cannot be empty in C:\web\Apache24\htdocs\www\Distant\Demo\El_library\html\WorkWithMistake.php on line 19

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