Hey there! Sorry to hear you are facing issues! That error message means that while Etcher correctly flashed the image into the drive, the resulting drive doesn’t contain the exact data that it flashed to it (i.e. some bits might be flipped), and its complaining a safety measure.
This usually happens due to low quality SD Cards, faulty USB ports, electro-magnetism, etc. Are you using any sort of adapter on the USB ports?