=== modified file 'Onboard/LayoutLoaderSVG.py'
--- old/Onboard/LayoutLoaderSVG.py	2017-04-17 23:53:19 +0000
+++ new/Onboard/LayoutLoaderSVG.py	2021-03-31 16:24:56 +0000
@@ -465,7 +465,7 @@
                 (strerror) = ex
                 raise Exceptions.LayoutFileError(
                     "Unrecognized modifier %s in"
-                    "definition of %s" (strerror, full_id))
+                    "definition of %s".format(strerror, full_id))
 
         value = attributes.get("action")
         if value: