Check the httpd.conf file to make sure that there is a ServerAlias entry for both domain.com and www.domain.com
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most likely you do not have the www record setup right in your DNS or not replicated as mentioned before.... Check with your provider
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If this is a relatively new account, its probably a DNS caching issue with your ISP and you just need to wait a day or two for it to work itself out. What is the domain name, so that we can check it for you?
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Pretty much as the others said, check your DNS records;
Name - Type - Value
@ - A - 188.8.131.52
* - CNAME - domain.com.
Replace 184.108.40.206 with your site's IP address
Replace domain.com with your domain name (without leading www) - note that the . at the end is IMPORTANT
The * means that any prefix will direct to your site; e.g. ftp, mail, etc.
To limit it to specific prefixes then simply replace * with www or whatever
The * is an excellent way of creating dummy sub-domains as any prefix will be directed to your default directory. With some judicious scripting you can check what the prefix used was and server different content as appropriate; great for social sites as you can let people use <username>.domain.com to go straight to their personal home page.