Hi Ivan,

We realized that we made a lot of installation mistakes to begin with when 
we first encountered the "concepts does not exist " error, so we just 
started a clean installation back then. 
However, I was reinstalling Arches lately, and I encountered that error 
again, but this time the only mistake was in how I set up postgres and the 
database, so I followed the settings here ( 
https://github.com/archesproject/arches/blob/master/arches/install/ubuntu_trusty_setup.sh
 
) as closely as I could, and the problem was solved.
And as Alexei mentioned you'll need to use python 2.7.6. We were installing 
Arches on Redhat 6 which comes with python2.6 so we had to install 
python2.7.6 and make sure that this is actually the version that is being 
used rather than 2.6

Hope that helps.

Best Regards,
Mai

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