publishWorkshopFile returns 2 when i pass preview string

[xietianze]

Thank you for this amazing ane !

here is the problem:

when i use this function:
public function publishWorkshopFile(name:String, preview:String, appId:uint, title:String, description:String, visibility:uint, tags:Array, fileType:uint):Boolean

and if preview parameter is not set as "", the function can't work, always returns 2, no matter what i string(picture address) i use as this preview parameter.

could you take a look, thanks a lot.

@Ventero