After installation when called for roscore following message received (win10)
straight dump of the terminal:
C:\Windows\System32>c:\opt\ros\melodic\x64\setup.bat
C:\Windows\System32>roscore
Traceback (most recent call last):
File "C:\opt\ros\melodic\x64\bin\roscore", line 36, in <module>
from rosmaster.master_api import NUM_WORKERS
File "C:\opt\ros\melodic\x64\lib\site-packages\rosmaster\__init__.py", line 35, in <module>
from .main import rosmaster_main
File "C:\opt\ros\melodic\x64\lib\site-packages\rosmaster\main.py", line 43, in <module>
import rosmaster.master
File "C:\opt\ros\melodic\x64\lib\site-packages\rosmaster\master.py", line 47, in <module>
import rosmaster.master_api
File "C:\opt\ros\melodic\x64\lib\site-packages\rosmaster\master_api.py", line 72, in <module>
from rosmaster.util import xmlrpcapi
File "C:\opt\ros\melodic\x64\lib\site-packages\rosmaster\util.py", line 48, in <module>
from defusedxml.xmlrpc import monkey_patch
ImportError: No module named defusedxml.xmlrpc
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