MODX admin gives 404 error after logged in, how to fix?

Question

MODX

I got a site on MODX Revo 2.7.0 whose admin panel gives a 404 error after you log in.
On the wrong username or password - works out as it should. I checked everything in the path configs.
While trying to find how to solve this problem, I found this https://github.com/modxcms/revolution/issues/3056, but it turned out that the problem was already fixed in my version.
The engine was obviously updated to version 2.7.0, since there is a "ugmtemp" folder in the root.
The logs show the latest errors:
/core/model/modx/modtemplatevar.class.php : 288) Old modTemplateVar getRender outputmethod is deprecated since version 2.2.0.
[/core/model/modx/modmenu.class.php : 145) modAction support is deprecated since version 2.3.0. Support for modAction has been replaced with routing based on a namespace and action name. Please update the extra with the namespace simpleupdater to the routing based system.
/core/model/modx/modmenu.class.php : 145) modAction support is deprecated since version 2.3.0. Support for modAction has been replaced with routing based on a namespace and action name. Please update the extra with the namespace format to the routing based system.
[2019-0
/core/model/modx/modmenu.class.php : 145) modAction support is deprecated since version 2.3.0. Support for modAction has been replaced with routing based on a namespace and action name. Please update the extra with the namespace autoredirector to the routing based system.
/core/model/modx/modmenu.class.php : 145) modAction support is deprecated since version 2.3.0. Support for modAction has been replaced with routing based on a namespace and action name. Please update the extra with the namespace collections to the routing based system.
[2
/core/model/modx/modmenu.class.php : 145) modAction support is deprecated since version 2.3.0. Support for modAction has been replaced with routing based on a namespace and action name. Please update the extra with the namespace console to the routing based system.
[2019-
/core/model/modx/modmenu.class.php : 145) modAction support is deprecated since version 2.3.0. Support for modAction has been replaced with routing based on a namespace and action name. Please update the extra with the namespace versionx to the routing based system.
[2019
/core/model/modx/modtemplatevar.class.php : 288) Old modTemplateVar getRender outputmethod is deprecated since version 2.2.0.
/core/model/modx/modtemplatevar.class.php : 288) Old modTemplateVar getRender outputmethod is deprecated since version 2.2.0.
core/model/modx/modtemplatevar.class.php : 288) Old modTemplateVar getRender outputmethod is deprecated since version 2.2.0.
/core/model/modx/modtemplatevar.class.php : 288) Old modTemplateVar getRender outputmethod is deprecated since version 2.2.0.
/core/model/modx/modtemplatevar.class.php : 288) Old modTemplateVar getRender outputmethod is deprecated since version 2.2.0.
Tell a beginner in MODX in which direction to move and can errors from the logs affect this?