I am running Arch Linux on my server with LUKS disc encryption. I do need to type in my password every time I reboot the machine. Sometimes I have a typo and this happens:
Welcome to GRUB! Attempting to decrypt master key... Enter passphrase for hd1,gpt2 (<disk uuid>): error: access denied error: no such cryptodisk found. error: disk `cryptouuid/<disk uuid>` not found. Entering rescue mode...
You can mount the partition with cryptomount:
Enter your password. Then load the module for a normal boot
Now you should get forwarded to the grub boot manager as you typed the password correct the first time.