Errors - Client denied by server configuration?

Trying to run a Defender scan. I got an error "Your server resource usage is too close to your limit. Please try again in 15 minutes."

When I checked my cPanel there was no problem with the bandwidth, but I found these errors listed in the log (I've redacted some of the file names for security):

[Sat Mar 25 14:42:09.513760 2017] [access_compat:error] [pid 420204:tid 140713069332224] AH01797: client denied by server configuration: /-----defender-access-test.php
[Sat Mar 25 14:42:09.499611 2017] [access_compat:error] [pid 428794:tid 140713136473856] AH01797: client denied by server configuration: /-----index.php,
[Sat Mar 25 14:42:09.483128 2017] [access_compat:error] [pid 420204:tid 140713069332224] AH01797: client denied by server configuration: /-----wp-db.php,
[Sat Mar 25 14:42:09.468773 2017] [access_compat:error] [pid 705602:tid 140713086117632] AH01797: client denied by server configuration: -----sample.bak,
[Sat Mar 25 14:42:09.453379 2017] [authz_core:error] [pid 420204:tid 140713069332224] AH01630: client denied by server configuration: -----.htaccess,

What exactly do these mean? How do I correct the issue so I can run a scan with Defender? I've opened the site to support. Thank you.