Failed to initialize Marketplace Manager driver

Hi there.

I’ve just installed ONe 5.2.1 on CentOS 7 and I can’t seem to figure out why oned fails to start.
The only meaningful message in the logs is:

Fri Jun 23 15:59:15 2017 [Z0][MKP][I]: Failed to load Marketplace Manager driver.
Fri Jun 23 15:59:15 2017 [Z0][ONE][E]: Could not load driver

Any ideas on where to look for a cause?

What is output of
cat /etc/one/oned.conf | grep MARKET_MAD -B 5 -A 5
from frontend