lime.fill.Frame isn't a constructor

I'm trying to write a JS script using Lime.js to make an animation walk across the screen. The source for the image is a spritesheet. When is gets to this

var frame = new lime.fill.Frame('image.png', 40, 50, 100, 100);

the debugger says that lime.fill.Frame isn't a constructor. Can any开发者_运维百科one help me out with this? I don't understand how to fix this. Thanks.

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It seems that the second parameter isn't the "goog.math.Rect" type.
lime.fill.Frame(img, rect, opt_offset, opt_size, opt_rotated)
Image fill. Parameters:
{string|Image|lime.Sprite} img
Image.
{goog.math.Rect} rect
Crop frame.
opt_offset
opt_size
opt_rotated