Yesterday I got the “NS_ERROR_FAILURE (0x80004005)” error when starting a VM instance in VirtualBox. Reinstalling didn’t work and the error was still there. The real problem is the security permission. Go to “System Preferences -> Security & Privacy”, confirm the permission needed by VirtualBox, then the problem is solved.

From here.

The goal is to use “pandoc” to convert a given html page to a PDF file.

From here, here, here and here.

From here.

From here.

From here and here.

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Y = λf.(λx.f (x x)) (λx.f (x x))

From here.