i think the error is occurring because there is already a where clause.
try changing:
$WADbSearch1_DefaultWhere = "0 != 0";
to :
$WADbSearch1_DefaultWhere = "AND 0 != 0";
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.