Are you saying that that's what comes up if you let the bootloader do it's default thing, but if you choose either OS manually it works fine? If so, then the bootloader is probably misconfigured. The default may be set to load a kernel that doesn't actually exist, rather than one of the two actual OS's.
So, as asked above, which bootloader are you using? Also, what menu options do you see when it starts? And what did you do that could have caused this change?
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