WARN: Unresolved specs during Gem::Specification.reset:
redcarpet (~> 3.1)
WARN: Clearing out unresolved specs.
Please report a bug if this causes problems.
C:/Ruby193/lib/ruby/gems/1.9.1/gems/jekyll-2.5.3/bin/jekyll:21:in `block in <top
(required)>`: cannot load such file -- jekyll/version (LoadError)
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/mercenary-0.3.5/lib/mercenary.r
b:18:in `program'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/jekyll-2.5.3/bin/jekyll:20:in `
<top (required)>'
from C:/Ruby193/bin/jekyll:23:in `load'
from C:/Ruby193/bin/jekyll:23:in `<main>'
When I type jekyll serve, I got this error