I am 1st time linux user I wanted to install mint from usb. At first it worked then when i tried to install it, I could not because of bitlocker. I then rebooted but windows already activated bitlocker, and afterwards any usb boot would show the exact same error message you have.
I ultimately had to wipe my encrypted partition of win and installed Ubuntu instead. I am happy for now, learning to use linux with Ubuntu and maybe try mint or arch when more advanced.
Maybe that helps you in some way best of luck.