I get the following error after I have created a group and have sent a "invite friends" with about 300 emails at once.  I would put a few of my email address's in and I would still get an invite.  When I would back out and resend not knowing that I was actually being sent an invite like five times.  Should I still be concerned that all emails haven't gotten the request?

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.