Update plugins/PostProcessingPlugin/scripts/ColorMix.py

OKay

Co-Authored-By: Hrybmo <john.hryb.4@gmail.com>

plugins/PostProcessingPlugin/scripts/ColorMix.py

@@ -137,7 +137,7 @@ class ColorMix(Script):
         #get layers to use
         startLayer = 0
         endLayer = 0
-        if self.getSettingValueByKey("a_unitsOfMeasurement") == "mm":
+        if self.getSettingValueByKey("measurement_units") == "mm":
             if firstHeight == 0:
                 startLayer = 0
             else: