There are errors in the ModX log and the admin panel /manager/ does not open, what should I do?

Question

PHP

Good afternoon!
Tell me please. Tried to log into the admin panel, and there is an error "HTTP ERROR 500". Then I see these errors in the log:

[2020-05-29 00:03:51] (ERROR @ /home/t/taron4uk/stroysbyt-71.ru/core/model/modx/modcachemanager.class.php : 344) Error caching lexicon topic lexicon/ru/core/setting

[2020-05-29 00:15:35] (ERROR @ /home/t/taron4uk/stroysbyt-71.ru/core/model/modx/modtemplatevar.class.php : 92) Произошла ошибка при сохранении дополнительного поля.Array

[2020-05-29 18:57:22] (ERROR @ /home/t/taron4uk/stroysbyt-71.ru/core/model/modx/modcachemanager.class.php : 317) Could not cache resource 1

[2020-05-29 18:57:22] (ERROR @ /home/t/taron4uk/stroysbyt-71.ru/core/model/modx/modcachemanager.class.php : 317) Could not cache resource 1

[2020-05-29 20:48:14] (ERROR @ /home/t/taron4uk/stroysbyt-71.ru/core/model/modx/modcachemanager.class.php : 317) Could not cache resource 1