Thank you, Bowo, for your very fast and detailed response.
To answer your question, I deleted DLM after I’d restored a backup of the site. I’ve since taken care of the critical error that kept me from seeing my WP dashboard (and the DLM error log), and have re-installed DLM.
Thank you again for an excellent plugin. DLM is great for securing your site’s error log and for easily seeing the error log’s contents, and now that I know where DLM keeps the error log, I’ll be able to look in there with FTP the next time there’s a critical error that keeps me from accessing my WP dashboard.
Cheers!