It looks like you were misusing this feature by going too fast. You've been blocked from using it. Learn more about blocks in the Help Center.
This is a standard error when you use Invite feature on Facebook website. Facebook uses this error even if you don't invite fast and just reached the limit. They have just this error for all problems.
How to avoid it:
1. Do not invite more than 500 people every day.
2. Sometimes Facebook blocks you randomly, just to test what you will do. Use this script, we have instructions on how to avoid this block:
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Here is detailed description:
On July 6 facebook starts to ban invite feature randomly even if you use mobile and invite manually. Less than 5% of users are affected, they test what users will do, they expect we start to pay for page likes

They show standard message 'going too fast'.
Here what you should do and fb will stop to ban Invite feature and everything will work fine
- each time you see ban msg - click on ‘let us know’ and write to fb that you see that by error. This is the most important step, if you don't report the block - they use it again!
- use the script with 4-5 seconds timeout between clicks for ρáíd version and big timeout for free version. No need to use bigger timeouts. And do not invite manually (unless you can take a 4-5 sec pause between your clicks.
- if you were banned twice in a raw you should take 2-3 days pause to reset that
- clear the fb cookies
- do not use fb at the same time when script is running
- if you ρáíd fb for boosting posts with paypal - ask them for the full refund, and they will stop to block you forever very quick xD
After some days and reports it stops to ban you.