How to get rid of bot verification errors

[mfrgolfgti]

I have a client who sells highly technical products and has lots and lots (a couple of hundred) pdf datasheets that can be downloaded from their website. But in order to download a datasheet, a user has to register on the site. Once they are registered, they can download whatever they want (I know this isn't a good idea but this wasn't set up by us and is historical). On doing a Moz crawl of the site, it came up with a couple of hundred 401 errors. When I investigated, they are all pages where there is a button to click through to get one of these downloads. The Moz error report calls the error "Bot verification".

My questions are:
Are these really errors?
If so, what can I do to fix them?
If not, can I just tell Moz to ignore them or will this cause bigger problems?

[Mr.Rui.Martins1]

@mfrgolfgti probably has to do with Moz bots being blocked due to a "user registration" requirement to be able to see the files.

[Mr.Rui.Martins1]

@mfrgolfgti believe that is happening because Moz bots are being blocked (due to user registration need) to view the files. 401s code errors are usually related to a "lack of valid authentication credentials".