Error: unable to split netmask from target expression

[Timothy Higinbottom <timhigins () gmail com>]

When I try to scan an ip address, this comes up:

Starting Nmap 6.47 ( http://nmap.org ) at 2015-04-27 19:52 Eastern Daylight
Time

NSE: Loaded 118 scripts for scanning.

NSE: Script Pre-scanning.

NSE: Script Post-scanning.

Read data files from: C:\Program Files (x86)\Nmap

Nmap done: 0 IP addresses (0 hosts up) scanned in 1.48 seconds

           Raw packets sent: 0 (0B) | Rcvd: 0 (0B)

Unable to split netmask from target expression: "an ip address (that i'd
rather not tell you)"

WARNING: No targets were specified, so 0 hosts scanned.

I'm new to nmap, so this may be my fault but any help would be appreciated.
Thanks!

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