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Try

su -c 'am startservice -n "com.example.app/.YourService"'

Don't forget to add quotation marks.

I was trying to start service from terminal and i got similar output. In my case i just added qoutation marks and that helped.

su -c 'am startservice -n "com.example.app/.YourSe-rvice" -e "extra' "value"'

Try

su -c 'am startservice -n "com.example.app/.YourService"'

Don't forget to add quotation marks.

Try

su -c 'am startservice -n "com.example.app/.YourService"'

Don't forget to add quotation marks.

Try

su -c 'am startservice "com.example.app/.YourService"'

--user 0 didn't work in my case

Try

su -c 'am startservice -n "com.example.app/.YourService"'

Don't forget to add quotation marks.