Hello. The path you showed me at show...50&postcount=9 is for a Mac. I'm on a PC. I tried to look for the mention of this problem in known issues but had no luck.
I put the WAFV_Required_c.j file in these 2 directories and restarted Dreamweaver.
C:\Program Files\Adobe\Adobe Dreamweaver CS4\configuration\Behaviors\Actions\WA Validation Toolkit\Apply Client Validators
C:\Documents and Settings\HP_Administrator\Application Data\Adobe\Dreamweaver CS4\en_US\Configuration\Commands
I should note that the WA Validation Toolkit\Apply Client Validators directories did not exist so I had to create them.
Any help would be appreciated.