ImportError:no module named hello_ecto

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hi,i am using ubuntu12.04+groovy.i followed ecto

when i run python ecto/samples/hello.py,i got error below:

root@baogege:~/catkin_ws/src/ecto_kitchen# python ecto/samples/hello.py Traceback (most recent call last):

File "ecto/samples/hello.py", line 30, in <module>

import ecto.hello_ecto as hello_ecto #a user library, that has a few ecto modules

ImportError: No module named hello_ecto

anyone can help me?thank you