--- a/VSEPackageFileSourceWriter.st	Fri Feb 13 02:54:12 2015 +0100
+++ b/VSEPackageFileSourceWriter.st	Fri Feb 13 02:59:36 2015 +0100
@@ -241,6 +241,10 @@
     classesToFileout := classesToFileout reject:[:cls | cls isSubclassOf: ProjectDefinition ].
     classesToFileout topologicalSort:[:a :b | b isSubclassOf:a].
 
+    (classesToFileout contains:[:cls | cls isPrivate]) ifTrue:[
+        self error:'Cannot file out private classes'.
+    ].
+
     rewriter := self class vseSourceRewriter new.
     rewriter classNamesToRewrite:classNameTranslations.
 
@@ -380,10 +384,10 @@
 !VSEPackageFileSourceWriter class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/libbasic3/VSEPackageFileSourceWriter.st,v 1.17 2015-02-10 20:25:31 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libbasic3/VSEPackageFileSourceWriter.st,v 1.18 2015-02-13 01:59:36 cg Exp $'
 !
 
 version_CVS
-    ^ '$Header: /cvs/stx/stx/libbasic3/VSEPackageFileSourceWriter.st,v 1.17 2015-02-10 20:25:31 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libbasic3/VSEPackageFileSourceWriter.st,v 1.18 2015-02-13 01:59:36 cg Exp $'
 ! !