[away3d] Invalid bitmapData! Must be power of 2 and not exceeding 2048

[rayYee]

I set BitmapMaterial.bitmapData=MyLoaderBmp.bitmapData ,
Away3d4.0 throw a Error :
"Invalid bitmapData! Must be power of 2 and not exceeding 2048".

I trace my bitmapData.width is 53 & my bitmapData.height is 53.

I found away3d4.0`s source :
"function isPowerOfTwo(value:int):void{ return value ?((value & -
value) == value) : false;}".

the bitmapData.width must be 1?