the variable 'blog-admin-dir' not found

[PaulusChen]

When I load blog-admin emacs tell me that. "Error (use-package): blog-admin :init: Symbol’s value as variable is void: blog-admin-dir"

And then I put -- (defvar blog-admin-dir "") -- in the config.el of that layer. It seems work ordinary.

• But * when I run the command “blog-admin-start” The message put below shown "Opening directory: No such file or directory, ./source/_drafts"

here is my config-file https://github.com/JamesChenFromChina/spacemacs.d/blob/master/layers/chenpeng-org/packages.el

and I'm ensure that I heve ran hexo init blog at my home directory

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