Playground execution failed: error: Couldn't lookup symbols

[nickvelloff]

Xcode Version 6.4 (6E35b)

Playground execution failed: error: Couldn't lookup symbols:
  __TMaC7Palette7Palette
  __TFC7Palette7PaletteCfMS0_FT10backgroundCSo6UIView7forViewS1__S0_

//: Playground - noun: a place where people can play

import UIKit
import XCPlayground
import SnapKit
import Palette

var canvas = UIView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
canvas.backgroundColor = UIColor.redColor()

var label = UILabel()
label.text = "That's right!"
label.sizeToFit()

canvas.addSubview(label)

label.snp_makeConstraints({ make in
    make.centerX.equalTo(canvas)
    make.centerY.equalTo(canvas)
})

let palette = Palette(background:canvas, forView:label)
label.textColor = palette.getContrastingColor()


XCPShowView("Canvas", canvas)