Your browser sent an invalid or no HTTP referer

[memetical]

ubuntu 14.04.3
apache 2.4.7

I'm trying to get a vichan imageboard working as an i2p eepsite.

Everything works just fine when I'm not using i2p and just running it within lampp.

When I run it as an eepsite, it mostly works. I can navigate through everything just fine, I can create new moderators and new boards, but I can't post anything on any of the boards. Not as a moderator and not as a regular anonymous user. Either way I get an error message:

Your browser sent an invalid or no HTTP referer

Anyone have any idea why this happens when I switch over to i2p, or even just generally what causes this error?

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BTW I'm running it directly inside of /var/www/html so I can access it with "localhost/mod.php" Not sure it that's relevant or not.

[Nobbie]

Where/what is the relation to Xampp??

[memetical]

I'm using lampp, that's xampp for linux...

[Nobbie]

What is i2p, what is an eepsite, what is vichan amd what is meant by "switch over to i2p"? Without this i2p thing everything runs fine on lampp.