In that case this isn't right, or ? : > You may want to try a larger value of the --backtrack option, such as --backtrack=30,
The --complete-graph and --backtrack options are only related in the sense that --complete-graph will reveal conflicts that would otherwise be detected, and when those conflicts are detected it will trigger backtracking in order to solve the conflicts.
oha, so I do need both parameters and this is invalid ?