aria2c: invalid option -- 'x'

[ld]

aria2c: invalid option -- 'x'
Exception: [OptionParser.cc:149] Failed to parse command-line options.

Usage: aria2c [OPTIONS] [URI | MAGNET | TORRENT_FILE | METALINK_FILE]...

Printing options tagged with '#help'.
See -h option to know other command-line options(#basic, #advanced, #http, #https, #ftp, #metalink, #bittorrent, #cookie, #hook, #file, #xml-rpc, #experimental, #help, #all).
Options:
-h, --help[=TAG|KEYWORD] Print usage and exit.
The help messages are classified with tags. A tag
starts with "#". For example, type "--help=#http"
to get the usage for the options tagged with
"#http". If non-tag word is given, print the usage
for the options whose name includes that word.

                          Possible Values: #basic, #advanced, #http, #https, #ftp, #metalink, #bittorrent, #cookie, #hook, #file, #xml-rpc, #experimental, #help, #all
                          Default: #basic
                          Tags: #basic,#help

Refer to man page for more information.

[kikyous]

aria2c的版本太旧了