Using substanced with Zeo and keep getting database conflict errors

Hi,

I have setup an instance of substanced which is a pyramid based cms using 
zodb. I am using zeo to connect to the zodb as described in the 
documentation:

https://substanced.readthedocs.io/en/latest/configuration.html?highlight=zeo


I start zeo using zdaemon and a config file:

/home/bodl-fox-svc/sites/bodl-fox-svc/bin/zdaemon -C 
/home/bodl-fox-svc/sites/bodl-fox-svc/zdaemon.cfg start


zdaemon.cfg looks like this.

<runner>

  program /home/bodl-fox-svc/sites/bodl-fox-svc/bin/runzeo  -C zeo.cfg

</runner>



and zeo.cfg looks like this:

<zeo>

  address /home/bodl-fox-svc/sites/bodl-fox-svc/data/zeosocket

</zeo>


<filestorage>

  path /home/bodl-fox-svc/sites/bodl-fox-svc/data/data.fs

</filestorage>


<eventlog>

  level INFO

  <logfile>

    path /home/bodl-fox-svc/sites/bodl-fox-svc/data/zeo.log

    format %(asctime)s %(message)s

  </logfile>

</eventlog>



the connection string in the ini file for the app is
zodbconn.uri = 
zeo:////home/bodl-fox-svc/sites/bodl-fox-svc/data/zeosocket?connection_cache_size=15000&blob_dir=/home/bodl-fox-svc/sites/bodl-fox-svc/data/blobs

I've set this up before and it worked fine but this application gives me 
conflict errors if I try and write to the database from two different 
locations. 

ConflictError: database conflict error (oid 0x30, class 
BTrees.IOBTree.IOBTree, serial this txn started with 0x03b9e3ac20faca33 
2016-09-13 13:32:07.729605, serial currently committed 0x03b9e3acb62e9

This is happening when I try and add data programatically from a bash file 
running a python script at the same time as I add data via a web interface. 
Any ideas?

I have the following versions -

zdaemon = 4.1.0

ZEO = 4.1.0

ZODB = 4.1.0

zodburi = 2.0

zope.copy = 4.0.3

zope.component = 4.2.2

zope.deprecation = 4.1.2

zope.interface = 4.1.2

ZopeSkel = 2.21.2

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