getting an error msg while installing kite api

Hi Team,

I'm trying to install kite python api on ubuntu machine.

I have also updated python to 3.7.3. I'm following below link fro installation.

but I'm getting below error msg .

I have observed that when I run the same command for second time, didn't get the error msg again .

Requirement already satisfied, skipping upgrade: asn1crypto>=0.21.0 in /usr/lib/python3/dist-packages (from cryptography>=2.7->autobahn[twisted]>=17.10.1->kiteconnect) (0.24.0)
Collecting pycparser (from cffi!=1.11.3,>=1.8->cryptography>=2.7->autobahn[twisted]>=17.10.1->kiteconnect)
Building wheels for collected packages: kiteconnect
Building wheel for kiteconnect ( ... done
WARNING: Legacy build of wheel for 'kiteconnect' created no files.
Command arguments: /usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-pubj4km6/kiteconnect/'"'"'; __file__='"'"'/tmp/pip-install-pubj4km6/kiteconnect/'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);'"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-16rlse56 --python-tag cp37
Command output: [use --verbose to show]
Running clean for kiteconnect
Failed to build kiteconnect
Installing collected packages: enum34, python-dateutil, pycparser, cffi, cryptography, txaio, autobahn, kiteconnect
Found existing installation: cryptography 2.1.4
Uninstalling cryptography-2.1.4:
Successfully uninstalled cryptography-2.1.4
Running install for kiteconnect ... done
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