Error Executing "port -R upgrade pango"

[Nathan Brazil]

I noticed that pango got updated.  So I perform the following:

% sudo port -R upgrade pango
--->  Deactivating pango 1.16.1_0
--->  Fetching pango
--->  Verifying checksum(s) for pango
--->  Extracting pango
--->  Applying patches to pango
--->  Configuring pango
--->  Building pango with target all
--->  Staging pango into destroot
--->  Packaging tgz archive for pango 1.16.1_1
--->  Installing pango 1.16.1_1
--->  Activating pango 1.16.1_1
--->  Cleaning pango
--->  Unpacking tgz archive for pango 1.16.1_1
--->  Deactivating pango 1.16.1_0
Error: Deactivating pango 1.16.1_0 failed: Active version of pango is  
not 1.16.1_0 but 1.16.1_1.

What's up w/ the error?  Is this a bug?