Mity CPU Platforms » MitySOM-5CSX Altera Cyclone V

I am running into the current error while running bitbake:

jliriano@ArmDev:~/yocto/build$ bitbake u-boot
ERROR: Execution of event handler 'external_linaro_toolchain_version_handler' failed
Traceback (most recent call last):
File "external_linaro_toolchain_version_handler(e)", line 12, in external_linaro_toolchain_version_handler(e=<bb.event.ConfigParsed object at 0x4aa8410>)
File "external-linaro-toolchain-versions.inc", line 4, in elt_get_gdb_version(d=<bb.data_smart.DataSmart object at 0x32ed690>)
NameError: global name 'CmdError' is not defined

WARNING: Host distribution "Ubuntu 13.10" has not been validated with this version of the build system; you may possibly experience unexpected failures. It is recommended that you use a tested distribution.

Is it possible that my current version of Ubuntu is incompatible?