``` [IJ]sbt:PragmaticScala> ghpagesPushSite [error] fatal: not a git repository (or any of the parent directories): .git [error] Nonzero exit code (128) running git. [error] (ghpagesUpdatedRepository) Nonzero exit code (128) running git. ``` after I delete the `~/.sbt/ghpages`,it's okay again