How to restore files from incremental VHD?

hello
i have full image and several incremental VHDs
main image mounted ok and all needed files is copied
but i can’t mount incremental images

start_urbackup_server --mountvhd gives no result

 Using temporary mountpoint /mnt/tmp1
 Loading FUSE kernel module...
 Starting VHD background process..
 Starting mounting...
 mount: enabling autoclear loopdev flag
 mount: going to use the loop device /dev/loop0
 /mnt/tmp1/volume: No such file or directory
 /mnt/tmp1/volume: No such file or directory
 mount: failed setting up loop device

vdfuse said “ERROR: opening vbox image failed”

–assemble gives strange output

 start_urbackup_server --assemble Image_C_160603-1347.vhd --assemble_output /mnt/tmp1
 /usr/sbin/start_urbackup_server: 262: [: x/mnt/tmp1: unexpected operator
 2016-09-04 18:55:37: Loaded -url- plugin
 2016-09-04 18:55:37: Loaded -cryptoplugin- plugin
 2016-09-04 18:55:37: ERROR: Could not open MBR file "Image_C_160603-1347.vhd".mbr

what else can i do?