mapping values are not allowed in this context

Question

# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager
  wifis:
   wlan0:
    dhcp4:no
    dhcp6:no
    addresses: [10.10.10.1/24]
    gateway4: 10.10.10.254

Error message:
line 8 column 13: mapping values are not allowed in this context

What are mapping values?

Solution

The issue is the indentation used within the .yaml file

In your example there is a two whitespace inndentation after 'network:' before 'version: 2' but after 'wifis:' and subsequently only one additional space is used as an indent. you can use either/or but not both, so the following will work:

# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager
  wifis:
    wlan0:
      dhcp4:no
      dhcp6:no
      addresses: [10.10.10.1/24]
      gateway4: 10.10.10.254

You MUST keep the indentations uniform

Comments

[steeldriver]

I don't know all the terminology, but I believe you need at least one space after the colon in each key: value pair i.e. dhcp4: no and dhcp6: no

[Sock Monkey]

I won't have access to that computer till tomorrow but the error is appearing on the addresses line, not the dhcp lines.

[slangasek]

line 8 of the file you've pasted is certainly the dhcp6: line, not the addresses: line; the comment line counts as a line.

[Sock Monkey]

www.yamllint.com corrected all the issues I was having.