Creates a new #GError with the given @domain and @code, and a message formatted with @format.
error domain
error code
printf()-style format for error message
#va_list of parameters for the message format
Return: a new #GError
ConstructionException GTK+ fails to create the object.
2.22
See Implementation
Creates a new #GError with the given @domain and @code, and a message formatted with @format.