Custom Kernel on debian causes virtualbox to error out

Failed to open a session for the virtual machine Debian 32bit.

Unresolved (unknown) host platform error. (VERR_UNRESOLVED_ERROR).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}