I think LendingClub is throttling the number of Loan Performance pages one can look at over some period of time.
When I would click on of the error links to open the Loan Performance page, LendingClub would return with their Temporarily Unavailable" maintenance web page, although other pages would still work.
I thought I slowed down the scan below the limit, but it was just trial and error. (I am running a scan at the moment on my machine and it seems to be going OK.)
Can you open one of the links, and keep it open, then try loading it again after a few minutes? This would help to make sure the link is not malformed or something.