Problem converting what appears to be a valid tmTheme file

[hulbert]

Prerequisites

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Description

When running the app command to convert a .tmTheme file I get an error that seems incorrect based on the error message (i.e. affect these settings are all in the array though I admit limited knowledge of the .tmTheme syntax).

This is just an adapted older version of TextMate's Solarized Light theme and works in TextMate 2.

$ apm init --theme scott-solarized-light --convert ~/Downloads/scott-solarized-light.tmTheme 
Could not find the required color settings in the theme.

The theme being converted must contain a settings array with all of the following keys:
  * background
  * caret
  * foreground
  * invisibles
  * lineHighlight
  * selection

Steps to Reproduce

1. Run above command with this file (renamed for Github) scott-solarized-light.tmTheme.txt

Versions

$ apm -v
apm  1.18.2
npm  3.10.10
node 6.9.5 x64
python 2.7.10
git 2.10.1