when i select 1) Download/select an extension i got this error

[Zaz-Exploit]

Traceback (most recent call last):
File "cromos.py", line 5, in
from libs.download import Download
File "/root/cromos/libs/download.py", line 12, in
from libs.build import Build
File "/root/cromos/libs/build.py", line 4, in
from drive import Drive
File "/root/cromos/libs/drive.py", line 9, in
import dropbox
ImportError: No module named dropbox