An object id occurred twice.
#GtkBuilder found an attribute that it doesn’t understand.
An object id is unknown
The specified property is unknown for the object class.
The specified signal is unknown for the object class.
#GtkBuilder found a tag that it doesn’t understand.
A type-func attribute didn’t name a function that returns a #GType.
#GtkBuilder couldn’t parse some attribute value.
An attribute that is required by #GtkBuilder was missing.
A required property value was missing.
A specified object type is of the same type or derived from the type of the composite class being extended with builder XML.
The wrong type was specified in a composite class’s template XML
The input contained a tag that #GtkBuilder can’t handle.
The input file requires a newer version of GTK+.
Error codes that identify various errors that can occur while using #GtkBuilder.