‘error’ is the default “Host Lockout Message” as specified in the Global Settings section of the iTSec plugin Settings page.
So it is the message to be displayed when a computer (host) has been locked out.
As it seems to be your ip address that is locked out, try to log into WP Dashboard using a different host. Then click on the “Release Lockouts” button on the iTSec plugin Dashboard (Active Lockouts metabox).
Or simply wait 15 minutes (default) and the lockout will be automatically released. Its only a temporary lockout.
Should the lockout be triggered by many 404 errors from your ip address (because you have enabled 404 Detection) then perhaps you should follow these instructions:
https://ithemes.com/security/fixing-ithemes-security-lockouts/
dwinden
