running cooja in contiki with cmd "ant run"

Then when I, ant run same appears again

BUILD FAILED
/home/user/contiki-3.0/tools/cooja/build.xml:199: The following error
occurred while executing this line:
/home/user/contiki-3.0/tools/cooja/apps/mspsim/build.xml:29: -
----------------
Could not find the MSPSim build file. Did you run "git submodule update
--init"?

My solution:

cd tools/cooja
rm -rf .git
cd ..
sudo git submodule update --init

Enjoy Cooja :)

The following worked for me:

1. Download the mspsim separately from this link https://github.com/contiki-os/mspsim (check your home/contiki/tools/mspsim and home/contiki-3.0/tools/mspsim directories, both are probably empty).
2. Remove the empty mspsim directory from both places
3. After unzip mspsim-master, paste the unzipped mspsim-master directory on both places
4. Rename the directory from mspsim-master to mspsim on both palces.
5. Go to terminal (user@instant-contiki:~/contiki-3.0/tools/cooja$) and run this command ant run
6. No need to use sudo

Enjoy!

Please notice the last warring. If your English is not good, use Goolge Translate please. Just run "git submodule update --init" before run "ant run".