See if moving args down works

config/services.yaml

@@ -6,10 +6,10 @@ services:
     pcm_icon.icon_extension:
         public: true
         class: Pcm\IconBundle\Twig\Functions\IconExtension
-        args:
-            directories:
+        arguments:
+            $directories:
                 - '%kernel.project_dir%/public/icons'
-            palletes:
+            $palletes:
                 - primary:
                     stroke: stroke-primary,
                     fill: fill-primary
@@ -20,3 +20,13 @@ services:
     Pcm\IconBundle\Twig\Functions\IconExtension:
         public: false
         alias: pcm_icon.icon_extension
+        arguments:
+            $directories:
+                - '%kernel.project_dir%/public/icons'
+            $palletes:
+                - primary:
+                    stroke: stroke-primary,
+                    fill: fill-primary
+                - white:
+                    stroke: stroke-white,
+                    fill: fill-white