Always show blank View

[denghuihua]

as the image show, I have try Folder and files, but it did not work when I installing ,It show a lot of warnings, below is the details

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/Users/huihuadeng/Drafter/Sources/drafter/Drafter.swift:143:5: warning: 'fileprivate' modifier is redundant for instance method declared in a fileprivate extension
fileprivate func craftInheritGraph() {
^~~~~~~~~~~~

/Users/huihuadeng/Drafter/Sources/drafter/Drafter.swift:163:5: warning: 'fileprivate' modifier is redundant for instance method declared in a fileprivate extension
fileprivate func craftinvokeGraph() {
^~~~~~~~~~~~

[4/4] Linking drafter
Build complete! (106.21s)