[oe] Multiple .bb files are due to be built which each provide bluez-libs

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Hi,
I got "Multiple .bb files" problms, but it seems not affects building. Could
some one give me some information about this multiple .bb files problems?
This is the log:

NOTE: Handling BitBake files: / (7315/7315) [100 %]
NOTE: Parsing finished. 0 cached, 7027 parsed, 288 skipped, 0 masked.
NOTE: Resolving any missing task queue dependencies
NOTE: multiple providers are available for virtual/libusb0 (libusb,
libusb-compat);
NOTE: consider defining PREFERRED_PROVIDER_virtual/libusb0
NOTE: preferred version 2.7.2 of libxml2 not available (for item libxml2)
NOTE: preferred version 2.7.2 of libxml2 not available (for item libxml2)
NOTE: preferred version 2.7.2 of libxml2-native not available (for item
libxml2-native)
NOTE: preferred version 2.7.2 of libxml2-native not available (for item
libxml2-native)
NOTE: Preparing runqueue
ERROR: Multiple .bb files are due to be built which each provide bluez-libs
(/home/derek/mini2440/oe/openembedded/recipes/bluez/bluez4_4.47.bb/home/derek/mini2440/oe/openembedded/recipes/bluez/
bluez-libs_3.33.bb).
 This usually means one provides something the other doesn't and should.
ERROR: Multiple .bb files are due to be built which each provide
bluez-utils-dbus (/home/derek/mini2440/oe/openembedded/recipes/bluez/
bluez4_4.47.bb /home/derek/mini2440/oe/openembedded/recipes/bluez/
bluez-utils_3.33.bb).
 This usually means one provides something the other doesn't and should.
ERROR: Multiple .bb files are due to be built which each provide util-linux
(/home/derek/mini2440/oe/openembedded/recipes/util-linux/util-linux_2.12r.bb/home/derek/mini2440/oe/openembedded/recipes/util-linux-ng/
util-linux-ng_2.16.bb).
 This usually means one provides something the other doesn't and should.
ERROR: Multiple .bb files are due to be built which each provide bluez-utils
(/home/derek/mini2440/oe/openembedded/recipes/bluez/bluez4_4.47.bb/home/derek/mini2440/oe/openembedded/recipes/bluez/
bluez-utils_3.33.bb).
 This usually means one provides something the other doesn't and should.
......

Thanks!