API talk:Block

What's mean "Invalid IP address specified"? I specified some Open Proxy for block but give me this error. How can I fix it?Ladsgroup 01:37, 16 November 2011 (UTC)
 * It means the IP address isn't valid. It doesn't exist, can't edit your wiki, and can't be blocked. What IP address did you attempt to block? Reach Out to the Truth 03:28, 16 November 2011 (UTC)

The "block" option doesn't seem to be available in my wikimedia version. What version is required? The only available "action" commands I have are: login, logout, query, expandtemplates, parse, opensearch, feedwatchlist, help, paraminfo. Block is not one of them.