Thanks bmhvanbenthum it is works.

plugin.py same error
2019-02-23 16:52:14.970 Error: (Enigma2) failed to load 'plugin.py', Python Path used was ':/usr/lib/python3.4/:/usr/lib/python3.4/plat-arm-linux-gnueabihf:/usr/lib/python3.4/lib-dynload'.
2019-02-23 16:52:14.970 Error: (ee) Module Import failed, exception: 'ImportError'
2019-02 ...

enigma2.py yes it works.
Wait 5 seconds
Standby:
Connect via wget to website: wget -q -O - http://192.168.1.6/web/powerstate?newstate=5
b'<?xml version="1.0" encoding="UTF-8"?>\n<e2powerstate>\n\t<e2instandby>true</e2instandby>\n</e2powerstate>\n'
OrderedDict([('e2powerstate', OrderedDict ...

same error.
2019-02-23 10:49:39.732 Error: (Enigma2) failed to load 'plugin.py', Python Path used was ':/usr/lib/python3.4/:/usr/lib/python3.4/plat-arm-linux-gnueabihf:/usr/lib/python3.4/lib-dynload'.
2019-02-23 10:49:39.732 Error: (E2) Module Import failed, exception: 'ImportError'
2019-02-23 10 ...

I have this error on my RPI3:
2019-02-23 09:12:07.441 Error: (Enigma2) failed to load 'plugin.py', Python Path used was ':/usr/lib/python3.4/:/usr/lib/python3.4/plat-arm-linux-gnueabihf:/usr/lib/python3.4/lib-dynload'.
2019-02-23 09:12:07.441 Error: (E2) Module Import failed, exception: 'ImportError ...