unknown or unclassified error
the #NMConnection object is invalid because a property has an invalid value. The error message will always be prefixed with "<setting-name>.<property-name>: ", where "<setting-name>" is the name of the setting with the invalid property, and "<property-name>" is the property that is invalid.
the #NMConnection object contains an invalid or inappropriate #NMSetting. The error message will always be prefixed with "<setting-name>: ", where "<setting-name>" is the name of the setting that is invalid.
the #NMConnection object is invalid because it is missing a required property. The error message will always be prefixed with "<setting-name>.<property-name>: ", where "<setting-name>" is the name of the setting with the missing property, and "<property-name>" is the property that is missing.
the #NMConnection object is missing an #NMSetting which is required for its configuration. The error message will always be prefixed with "<setting-name>: ", where "<setting-name>" is the name of the setting that is missing.
the #NMConnection did not contain the requested #NMSetting property
an operation which requires a secret was attempted on a non-secret property
the #NMConnection object did not contain the specified #NMSetting object
Describes errors that may result from operations involving a #NMConnection or its #NMSettings.
These errors may be returned directly from #NMConnection and #NMSetting methods, or may be returned from D-Bus operations (eg on #NMClient or #NMDevice), where they correspond to errors in the "org.freedesktop.NetworkManager.Settings.Connection" namespace.