sprite generation error

[niepi]

Hi,

• i use brunch 1.4.3
• i use the sprite generation with node-sprite
• when i build my project i get the following error

convert: invalid argument for option `-size': 60xNaN @ error/convert.c/ConvertImageCommand/2570.

• the json looks fine to me

{
  "name": "Set_Detail_PNGs",
  "checksum": "d46bdcec492528abde787be6ca033c8b",
  "shortsum": "d46bd",
  "images": [
    {
      "name": "01_Play_Butt_L_Waveform",
      "filename": "01_Play_Butt_L_Waveform.png",
      "checksum": "eac3ddde16b71707787e206b811a876e",
      "width": 60,
      "height": 60,
      "positionX": 0,
      "positionY": 0
    }
  ]
}

I'm not sure if this is a brunch or node-sprite problem

[paulmillr]

what happens if you use stylus-brunch from the git (see readme for how to do this)?

[niepi]

still get the same error