IECWriteD64 does not work

If you own an Amiga and a C64 you can share files using Easy1541. With a special cable you can hook up a 1541 disk drive to an Amiga and format disks, copy files to and from etc. You also can write d64 images to a real floppy using the command IECWriteD64. The problem I have is that this does not work anymore. And I have no clue why. I also cannot format disks. 

If there's anybody that can shed some light, please comment!