xorg7 installato ma

hitman@localhost ~ $ amsn
Application initialization failed: this isn't a Tk applicationunknown color name "Black"
Error in startup script: this isn't a Tk applicationunknown color name "Black"
(default value for "-highlightcolor" in widget ".")
invoked from within
"load /usr/lib/tk8.4/../libtk8.4.so Tk"
("package ifneeded" script)
invoked from within
"package require Tk"
(file "/usr/bin/amsn" line 46)

che succede?
come posso risolvere?