need help with ddwrt_cgibin_exec exploit

[Binoy Dalal <lttazz99 () gmail com>]

i tried running ddwrt_cgibin_exec exploit against a remote server, i filled
in the rhost,lhost,lport=80 set the payload to generic/shell_reverse_tcp
after putting in exploit a message saying "handler failed to bind to <my
IP>" is generated and then this is displayed
[*] Sending GET request with encoded command line...
[*] Giving the handler time to run...
[*] Exploit completed, but no session was created.
why is no session being created?

PS:i've just started out so please be patient
thanks

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