Failed to open Portfile from registry

[Ryan Schmidt]

When upgrading a port in a MacPorts prefix that had been running a prior version of trunk and which I just updated to the latest, I get this warning:


$ sudo /x86_64-10.6-mp/bin/port -u upgrade zlib
--->  Computing dependencies for zlib
--->  Fetching zlib
--->  Verifying checksum(s) for zlib
--->  Extracting zlib
--->  Applying patches to zlib
--->  Configuring zlib
--->  Building zlib
--->  Staging zlib into destroot
--->  Computing dependencies for zlib
--->  Installing zlib @1.2.5_0
Warning: Failed to open Portfile from registry for zlib @1.2.4_1
--->  Deactivating zlib @1.2.4_1
--->  Activating zlib @1.2.5_0
--->  Cleaning zlib
Warning: Failed to execute portfile from registry for zlib @1.2.4_1
--->  Uninstalling zlib @1.2.4_1


Is this expected?