A time crossing error means that you are trying to specify a time that is already occupied in the doctor's schedule.
The error text on a red background indicates the time that you tried to reuse.
The window where you enter the new time is called«Новое событие на [дата]», and the already occupied time is highlighted in yellow.
How to fix the error 
1. Find the day and time indicated in the error in the graph and click directly on the time highlighted in green.
2. In the window that opens, specify the new time. The window is called «Редактирование события на [дата]».
3. Click «Сохранить».
For example: previously, an employee was assigned a schedule from 15:00 to 20:00, now you need to create a schedule from 10:00 to 16:00. To change the schedule for this day.
