error: 'DigiKeyboard' does not name a type

[digi_guy]

As a general rule what does this error mean?

Code: [Select]

error: 'DigiKeyboard' does not name a type
I saw it in dougal's recent thread, and now I'm running into it while trying to get an sha1 hash working.

If I load and run the Digikeyboard example on its own I have no problem. If I put #include "sha1.h" at the top I get that error. I had been getting that error with sha1.h but somehow it stopped.