kali/updates Release' does not have a Release file.

i've scanned my system with clamtk after 7 days and it shows round about 345 threats and suddenly my system crashed and then i am getting this issue on update command.

root@kali:/home/oohoo# apt-get update
Hit:1 http://deb.i2p2.no unstable InRelease
Hit:2 http://deb.anydesk.com all InRelease
Hit:3 http://dl.google.com/linux/chrome/deb stable InRelease
Ign:4 http://security.kali.org/kali-security kali/updates InRelease
Ign:5 http://http.kali.org/kali kali InRelease
Err:6 http://security.kali.org/kali-security kali/updates Release
404 Not Found [IP: 192.99.200.113 80]
Err:7 http://http.kali.org/kali kali Release
404 Not Found [IP: 192.99.200.113 80]
Hit:8 https://packagecloud.io/AtomEditor/atom/any any InRelease
Reading package lists... Done
E: The repository 'http://security.kali.org/kali-security kali/updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://http.kali.org/kali kali Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.


i'm a student and i learning coding!!