Error 200 when adding categories to nav menus

When adding categories to nav menus it comes up with this error:

NXS_XMLRPC_Client Object
(
[server] => https://www.livejournal.com
[port] => 80
[path] => /interface/xmlrpc
[scheme] => http
[useragent] => The Incutio XML-RPC PHP Library
[response] =>
[message] => NXS_XMLRPC_Message Object
(
[message] =>
[messageType] => fault
[faultCode] => 200
[faultString] => Client error: Missing required argument(s): event
[methodName] =>
[params] => Array
(
[0] => Array
(
[faultString] => Client error: Missing required argument(s): event
[faultCode] => 200
)

)

[_arraystructs] => Array
(
)

[_arraystructstypes] => Array
(
)

[_currentStructName] => Array
(
)

[_param] =>
[_value] =>
[_currentTag] =>
[_currentTagContents] =>
[_parser] => Resource id #1587
[currentTag] => int
)

[debug] =>
[timeout] => 25
[error] => NXS_XMLRPC_Error Object
(
[code] => 200
[message] => Client error: Missing required argument(s): event

It seems to be functioning okay, does anyone know if this is important or can it be ignored? Also, what is the best way to show a number of posts from each category on the homepage? How can I have the options at the bottom of blog pages to skip to different pages? Like at the bottom of a google search? Thanks!

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