[racket] Planet error: docs failure: read: illegal use of "."

I've posted my first planet package, but I'm getting some weird error in
building documentation when installing it from DrRacket, which doesn't occur
at all when I install using 'planet install ...' at the command line. Any
ideas what is going wrong? Is there something that I might be missing in my
scribblings documentation (it's very minimal at the moment)? Or something
not right with the way the .plt archive is being made?

Here's a portion of the log from DrRacket (there are two occurrences of a
"docs failure" error):

PLaneT: raco setup: --- pre-installing collections ---
PLaneT: raco setup: --- compiling collections ---
PLaneT: raco setup: making: <planet>/nah22/racketui.plt/1/1 (RacketUI)
PLaneT: raco setup:  in <planet>/nah22/racketui.plt/1/1
... <snip> ...
PLaneT: raco setup: --- updating info-domain tables ---
PLaneT: raco setup: updating: /Users/nhamid/Library/Racket/planet/300/
5.1.2.3/cache.rktd
PLaneT: raco setup: --- creating launchers ---
PLaneT: raco setup: --- building documentation ---
PLaneT: raco setup: docs failure: read: illegal use of "."
PLaneT: raco setup: --- installing collections ---
PLaneT: raco setup: --- post-installing collections ---
PLaneT: raco setup:
PLaneT: ------------- Rebuilding documentation index -------------
PLaneT: raco setup: version: 5.1.2.3 [3m]
PLaneT: raco setup: variants: 3m
PLaneT: raco setup: main collects: /Applications/Racket.git/plt/collects
PLaneT: raco setup: collects paths:
PLaneT: raco setup:   /Users/nhamid/Library/Racket/5.1.2.3/collects
PLaneT: raco setup:   /Applications/Racket.git/plt/collects
PLaneT: raco setup: --- pre-installing collections ---
PLaneT: raco setup: --- compiling collections ---
PLaneT: raco setup: making: scribblings/main/user
PLaneT: raco setup: --- updating info-domain tables ---
PLaneT: raco setup: updating: info-domain/compiled/cache.rktd
PLaneT: raco setup: --- creating launchers ---
PLaneT: raco setup: --- building documentation ---
PLaneT: raco setup: docs failure: read: illegal use of "."
PLaneT: raco setup: --- installing collections ---
PLaneT: raco setup: --- post-installing collections ---
...

The corresponding output from 'planet install' at the command line has no
problems:
raco setup: --- pre-installing collections ---
raco setup: --- compiling collections ---
raco setup: making: <planet>/nah22/racketui.plt/1/1 (RacketUI)
raco setup:  in <planet>/nah22/racketui.plt/1/1
raco setup:  in <planet>/nah22/racketui.plt/1/1/scribblings
raco setup: making: <planet>/nah22/racketui.plt/1/1/htdocs
raco setup: making: <planet>/nah22/racketui.plt/1/1/htdocs/css
raco setup: making: <planet>/nah22/racketui.plt/1/1/htdocs/css/smoothness
raco setup: making:
<planet>/nah22/racketui.plt/1/1/htdocs/css/smoothness/images
raco setup: making: <planet>/nah22/racketui.plt/1/1/htdocs/js
raco setup: making: <planet>/nah22/racketui.plt/1/1/planet-docs
raco setup: making: <planet>/nah22/racketui.plt/1/1/planet-docs/racketui
raco setup: making: <planet>/nah22/racketui.plt/1/1/scribblings
raco setup: --- updating info-domain tables ---
raco setup: updating: /Users/nhamid/Library/Racket/planet/300/
5.1.2.3/cache.rktd
raco setup: --- creating launchers ---
raco setup: --- building documentation ---
raco setup: running:
<planet>/nah22/racketui.plt/1/1/scribblings/racketui.scrbl
raco setup: skipping: handin-server/scribblings/handin-server.scrbl
raco setup: skipping: scribblings/main/user/start.scrbl
raco setup: skipping: scribblings/main/user/search.scrbl
raco setup: rendering:
<planet>/nah22/racketui.plt/1/1/scribblings/racketui.scrbl
raco setup: --- installing collections ---
raco setup: --- post-installing collections ---
------------- Rebuilding documentation index -------------
raco setup: version: 5.1.2.3 [3m]
raco setup: variants: 3m
raco setup: main collects: /Applications/Racket/collects
raco setup: collects paths:
raco setup:   /Users/nhamid/Library/Racket/5.1.2.3/collects
raco setup:   /Applications/Racket/collects
raco setup: --- pre-installing collections ---
raco setup: --- compiling collections ---
raco setup: making: scribblings/main/user
raco setup: --- updating info-domain tables ---
raco setup: --- creating launchers ---
raco setup: --- building documentation ---
raco setup: skipping: handin-server/scribblings/handin-server.scrbl
raco setup: running: scribblings/main/user/start.scrbl
raco setup: running: scribblings/main/user/search.scrbl
raco setup: rendering: scribblings/main/user/start.scrbl
raco setup: rendering: scribblings/main/user/search.scrbl
raco setup: --- installing collections ---
raco setup: --- post-installing collections ---
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