No booting after kernel rebuild possible

Hello, using Debian 2.1 from the O'Reilly-Book "Learning Debian GNU/Linux", I'm wondering about a problem after kernel rebuild, no starting neither with the new kernel nor with the old kernel is possible: Partition check: request_module[block-major-8]: Root fs not mounted VFS: Cannot open root d

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Hello, using Debian 2.1 from the O'Reilly-Book "Learning Debian GNU/Linux", I'm wondering about a problem after kernel rebuild, no starting neither with the new kernel nor with the old kernel is possible: Partition check: request_module[block-major-8]: Root fs not mounted VFS: Cannot open root d