diff -r 7e52091795e8 -r 31ebb6be32b0 src/Pure/Admin/component_rsync.scala
--- a/src/Pure/Admin/component_rsync.scala	Tue Mar 26 11:32:16 2024 +0100
+++ b/src/Pure/Admin/component_rsync.scala	Tue Mar 26 11:45:49 2024 +0100
@@ -50,7 +50,7 @@
 
       val platform_name =
         proper_string(Isabelle_System.getenv("ISABELLE_PLATFORM64"))
-          .getOrElse(error("No 64bit platform"))
+          .getOrElse(error("Missing ISABELLE_PLATFORM64"))
 
       val platform_dir =
         Isabelle_System.make_directory(component_dir.path + Path.basic("platform_" + platform_name))