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The second (as shown below) is within the Start-Up Repair menu. At this point, Windows has identified that something caused the system to shut down unexpectedly and it is trying to resolve the issue. In order for Start-Up Repair to run on a system that is Bitlocker encrypted, it will prompt for the Bitlocker recovery key. If you are receiving this message, please restart often restarting the PC, and select selecting 'Start Windows Normally' when prompted . Then, the computer should start normallywill resolve the issue. This should allow the user to resume working with little interruption.
*It is possible that this error message is happening due to the a software or hardware issue (i.e. blue screening). If this is the case, please note it is NOT a Bitlocker issue, but a system error.