Problem with kamailio-utils-modules (>= 5.2.3)

Hi Everybody, every time wen I install Load-balanse, I see error:

yeti-lb : Depends: kamailio-utils-modules (>= 5.2.3) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
root@yeti:~# pgrep kamailio
root@yeti:~# sudo apt update && apt install yeti-lb
-bash: sudo: command not found

I wrote:
deb http://deb.kamailio.org/kamailio52 stretch main
deb-src http://deb.kamailio.org/kamailio52 stretch main
But it changed nothing

I have no idea why you are trying to use sudo.

Without sudo I have the same situation:

root@yeti:~# apt update && apt install yeti-lb
Get:1 http://pkg.yeti-switch.org/debian/buster 1.10 InRelease [7,126 B]
Hit:2 http://security.debian.org buster/updates InRelease
Hit:3 http://deb.debian.org/debian buster InRelease
Hit:4 http://apt.postgresql.org/pub/repos/apt buster-pgdg InRelease
Hit:5 http://deb.kamailio.org/kamailio52 stretch InRelease
Hit:6 http://security.debian.org/debian-security buster/updates InRelease
Hit:7 http://deb.debian.org/debian buster-updates InRelease
Hit:8 http://ftp.us.debian.org/debian buster InRelease
Hit:9 http://ftp.us.debian.org/debian buster-updates InRelease
Fetched 7,126 B in 1s (9,306 B/s)
Reading package lists… Done
Building dependency tree
Reading state information… Done
1 package can be upgraded. Run ‘apt list --upgradable’ to see it.
Reading package lists… Done
Building dependency tree
Reading state information… Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
yeti-lb : Depends: kamailio-utils-modules (>= 5.2.3) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

you are using debian 10 buster, but for unknown reason trying to use kamailio repository for stretch

I install load balansing with your manual. And when i touch command apt update && apt install yeti-lb, it asks about : kamailio-utils-modules (>= 5.2.3)

use repositories for buster

Thanks for your help )