Error in re-building vignettes:
  ...
Loading required package: Matrix
Loading required package: foreach
Loaded glmnet 2.0-13

Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Shutting down cluster.
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Warning: Ignoring unknown aesthetics: position
Killed