disk slicing warning installation failed

I am using usb to install
After I leave the Fdisk partition editor and chose the boot manager
a disk slicing warning appeared
Code:
chunk 'ad4s1' [2048..411647]does not start on a track boundary
      chunk 'ad4s2' [411648..270620671]does not start on a track boundary
      chunk 'X' [27062072..270630863]does not start on a track boundary
      chunk 'ad4s3' [945829888..976773167]does not start on a track boundary

then no matter I press OK or Ese it returns to the "choose custom installation options" site

Is there anyone knows what's happening?
Thanks
 
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