Try theme name without quotes.

jpsacha · jpsacha · commit be704eb23342 · 2019-03-03T18:56:17.000-05:00
diff --git a/Gemfile b/Gemfile
@@ -12,7 +12,7 @@ ruby "2.5.1"
 gem "jekyll", "~> 3.8.5"
 
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
-# gem "minima", "~> 2.0"
+gem "minima", "~> 2.0"
 
 gem "just-the-docs", "~> 0.2.3"
 
diff --git a/_config.yml b/_config.yml
@@ -24,7 +24,7 @@ github_username:  ij-plugins
 # Build settings
 markdown: kramdown
 #theme: minima
-theme: "just-the-docs"
+theme: just-the-docs
 plugins:
   - jekyll-feed
 
