What would cause an error message on a PS2 when my son tried using his dreamgear lava glow wireless controller?
I couldn't find anything online, might have to buy a new controller.
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DreamGEAR® Launches Radium PS3 Controllers for Every Gamer’s Needs
New line of controllers includes dual rumble motors, SIXAXIS™ compatibility
Torrance, CA ( PRWEB ) June 9, 2010 -- dreamGEAR®, a leading provider of high-quality and cutting-edge accessories for video games, is launching the Radium, a new line of affordable, high-performance controllers for the Sony PS3, boasting features important to gamers such as dual rumble motors and SIXAXIS™ technology compatibility.
The competitively priced Radium controllers – ranging from $24.99 to $39.99 – come in three versions to satisfy the demands of consumers: Radium Wireless Controller with SIXAXIS compatibility, Radium Wireless Controller and the Radium Wired Controller.
All versions of the Radium controllers come standard with dual rumble motors powered by Immersion Rumble Technology, which vibrate at each action-packed moment of players’ favorite games. The tactile feedback elevates gamers’ awareness with an added sensation that literally allows them to feel the game. The top of the line controllers feature SIXAXIS technology, which responds to the player’s movement along six directional axes, turning each slight tilt of the controller into an electronic cue – perfect for racing, combat and action games.

I couldn't find anything online, might have to buy a new controller.
It either means your usb connector is broken, or your batteries are harmed inside your controller. I suggest you go to the toys'R'us and tell them to try it out on their demo PS3.