Sooner or latter everyone will make mistakes and have failures. This is just a natural part of life and everyone will fail, including entrepreneurs. Since this is a part of life, out job is to understand and accept this, making the best of it and learning valuable life lessons. This is the only way to defeat a crisis and not despair.
In the following video I address this topic and give some advice of how to cope with crisis.
Video Entrepreneur: Do not despair in a crisis