Index: openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl,v
diff -u -r1.29.6.3 -r1.29.6.4
--- openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl	15 Feb 2014 00:32:31 -0000	1.29.6.3
+++ openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl	4 Sep 2014 12:19:41 -0000	1.29.6.4
@@ -159,7 +159,10 @@
   PackageMgr ad_instproc require {{-url ""} package_id} {
     Create package object if needed.
   } {
-    if {$package_id eq ""} {error "package_id must not be empty"}
+    if {$package_id eq ""} {
+      #::xo::show_stack
+      error "package_id must not be empty"
+    }
 
     #my log "--R $package_id exists? [my isobject ::$package_id] url='$url'"