Invalid num components 4: Only 1 or 3 component JPEGs are currently supported.

4 component JPEGs are usually JPEG files saved by Photoshop in the CMYK colour space.
Support was added for these types of JPEG files in Indigo 3.6.10.
Please update your Indigo version to 3.6.10 or newer: http://www.indigorenderer.com/forum/viewtopic.php?f=1&t=12296