Cannot partition Macintosh HD
Your CoreStorage Volume Group doesn't contain a complete stack which also includes a Logical Storage Family and Logical Volume(s) besides the existing Logical Volume Group and the Physical Volume(s).

Probably that's the reason why the command fails.

But there is no need to resize the stack since it's useless as it is configured now: it doesn't contain a valid volume to install to. You may now either create a Logical Volume in the existing LVG or completely delete the CoreStorage partition scheme and revert to a classical partition setup:


Create a Logical Volume:

Quit Disk Utility, open in the menu bar Utilities -> Terminal and enter

diskutil cs list #(and copy the Logical Volume Group UUID (=lvgUUID))
diskutil cs createVolume lvgUUID type name size


In your case something like:

diskutil cs createVolume 49D3CD66-F48B-4DB8-97D0-A8A1C7C5434F jhfs+ "Macintosh HD" 100%


Enter exit, quit Terminal
Erase the CoreStorage Logical Volume Group:

Quit Disk Utility, open in the menu bar Utilities -> Terminal and enter

diskutil cs delete lvgUUID


In your case:

diskutil cs delete 49D3CD66-F48B-4DB8-97D0-A8A1C7C5434F


Enter exit, quit Terminal and reopen Disk Utility

Partition the empty space as you need it and quit Disk Utility afterwards


Now continue installing Yosemite