Unable to perform attack

[Pavitra7]

The axtls server is run successfully. Following is the message on the server terminal:
./axhttpd -p 127.0.0.1:8081 -s 127.0.0.1:8443 -key axtls-root/ssl/server.key -cert axtls-root/ssl/server.crt -w axtls-root/www
YEAH
=== CERTIFICATE ISSUED TO ===
Common Name (CN):
Organization (O): Internet Widgits Pty Ltd
Country (C): AU
State (ST): Some-State
=== CERTIFICATE ISSUED BY ===
Common Name (CN):
Organization (O): Internet Widgits Pty Ltd
Country (C): AU
State (ST): Some-State
Not Before: Mon Feb 29 12:34:00 2016
Not After: Wed Mar 30 12:34:00 2016
RSA bitsize: 1024
Sig Type: SHA256
addcgiext .lua,.lp,.php
axhttpd/2.1.5: listening on ports 8081 (http) and 8443 (https)

But when the attack is run, following is the message:
[!] dlopen failed: (null)

I dont know how to proceed. I have changed the library path to the path of libaxtls.so.1.2
Kindly help me to proceed further.