error starting vm

find the device that is using 192.168.0.100 that is duplicating the address you've either hard coded or your dhcp server doesn't know about and it is trying to assign it to you

all other vm are down

from your host do a ping 192.168.0.100 or a nslookup 192.168.0.100 and find the device

am geting

nslookup 192.168.0.100
Server:  dns.google
Address:  8.8.8.8

*** dns.google can't find 192.168.0.100: Non-existent domain

ping 192.168.0.100

Pinging 192.168.0.100 with 32 bytes of data:
Reply from 192.168.0.100: bytes=32 time<1ms TTL=128
Reply from 192.168.0.100: bytes=32 time<1ms TTL=128
Reply from 192.168.0.100: bytes=32 time<1ms TTL=128
Reply from 192.168.0.100: bytes=32 time<1ms TTL=128

have you checked your dhcp server to see what mac address is using 192.168.0.100

where do i check my  dhcp host i did this

>ipconfig

Windows IP Configuration


Ethernet adapter Ethernet:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Ethernet adapter VirtualBox Host-Only Network #3:

   Connection-specific DNS Suffix  . :
   Link-local IPv6 Address . . . . . : fe80::6462:52e5:4a56:1ec6%15
   IPv4 Address. . . . . . . . . . . : 192.168.56.103
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . :

Ethernet adapter Ethernet 4:

   Connection-specific DNS Suffix  . :
   Link-local IPv6 Address . . . . . : fe80::3c6f:b892:2c04:6c57%21
   IPv4 Address. . . . . . . . . . . : 192.168.0.100
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   IPv4 Address. . . . . . . . . . . : 192.168.56.115
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.0.1
                                       192.168.56.1

you most definitely have a duplicate address on the lan that uses the bridge adapter.

fortunately the message provides the mac address of the culprit.

it is a Qualcomm device should that help identifying it.