Unable to connect to xpra: rencode import error: No module named rencode

I am using docker toolbox on windows. Below is the error log
2018-04-16 21:40:39,608 rencode import error: No module named rencode
Error running "xauth add :100 MIT-MAGIC-COOKIE-1 65606420196a4550a9d4a7e5b67551cd": [Errno 2] No such file or directory
_XSERVTransmkdir: ERROR: euid != 0,directory /tmp/.X11-unix will not be created.
2018-04-16T21:40:39.776043208Z 
X.Org X Server 1.18.4
Release Date: 2016-07-19
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.4.0-97-generic x86_64 Ubuntu
Current Operating System: Linux 2896d70629be 4.4.100-boot2docker #1 SMP Tue Nov 21 17:54:42 UTC 2017 x86_64
Kernel command line: loglevel=3 user=docker console=ttyS0 console=tty0 noembed nomodeset norestore waitusb=10:LABEL=boot2docker-data base initrd=/boot/initrd.img BOOT_IMAGE=/boot/vmlinuz64 
Build Date: 13 October 2017  01:57:05PM
xorg-server 2:1.18.4-0ubuntu0.7 (For technical support please see http://www.ubuntu.com/support) 
Current version of pixman: 0.33.6
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(++) Log file: "/home/user/.xpra/Xorg.:100.log", Time: Mon Apr 16 21:40:39 2018
(++) Using config file: "/etc/xpra/xorg.conf"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
2018-04-16 21:40:40,447 Warning: zlib is the only compressor enabled
2018-04-16 21:40:40,447  install and enable lzo or lz4 support for better performance
2018-04-16 21:40:40,447 Warning: 'rencode' packet encoder not found
2018-04-16 21:40:40,447  the other packet encoders are much slower
2018-04-16 21:40:40,448 server uuid is 3ff2bc66f8d04566a88c9e55dfe9a71e
2018-04-16 21:40:40,659 cannot load dbus helper: No module named dbus
2018-04-16 21:40:40,945 started child '/usr/local/bin/electrum' with pid 20
2018-04-16 21:40:40,946 xpra server version 0.15.8 (r11211)
2018-04-16 21:40:40,946 running with pid 1
2018-04-16 21:40:41,264 xpra is ready.
2018-04-16 21:49:24,596 New tcp connection received from ('192.168.99.1', 51741)
2018-04-16 21:49:31,014 Disconnecting client '192.168.99.1:51741': invalid packet encoding: rencode is not available
2018-04-16 21:57:18,365 New tcp connection received from ('192.168.99.1', 52029)
2018-04-16 21:57:18,847 Disconnecting client '192.168.99.1:52029': invalid packet encoding: rencode is not available
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