code: function CannotBuildDependencyGraphError(nestedError){
    this.name = 'CannotBuildDependencyGraphError';
    this.message = nestedError.message;
    this.stack = nestedError.stack;
  
    this.nestedError = nestedError;
  }
docs: Wraps errors returned from Topo representing a failure to build the dependency graph.
  @param nestedError {Error} error encountered topo sorting the dependency graph.
  @constructor