can't create a new thread, Too many live links/images found in your post content...

[vargabesz]

I tried to create a new thread but the forum engine won't let me..
I'm getting: Too many live links/images found in your post content. Please edit your post or contact the administrator.
I only have one URL inside the content, which is pointing to the official Zabbix documentation, but even if I remove it I'm still getting that message..