Petalinux 2017.4 - "petalinux-build" fails

Hi, I am using zcu102+ad9009 develop kit. When I tried to use "petalinux-bulid" command to compile the petalinux project given in ug1144 page 27, I've got the following error:

baid@ubuntu:~/WorkSpace/newproject$ petalinux-build
[INFO] building project
[INFO] sourcing bitbake
INFO: bitbake petalinux-user-image
ERROR: OE-core's config sanity checker detected a potential misconfiguration.
Either fix the cause of this error or at your own risk disable the checker (see sanity.conf).
Following is the list of potential problems / advisories:

You system needs to support the en_US.UTF-8 locale.

Summary: There was 1 ERROR message shown, returning a non-zero exit code.
ERROR: Failed to build project
webtalk failed:PetaLinux statistics:extra lines detected:notsent_nofile!
webtalk failed:Failed to get PetaLinux usage statistics!

But when I type "locale" cmd, I found the language has been already set as en_US.UTF-8, showed below.

baid@ubuntu:~/WorkSpace/newproject$ locale
LANG=en_US.UTF-8
LANGUAGE=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=en_US.UTF-8

How can I fixed my essue?