This is definitely due to the step missed during the installation, which you reported here: 1.7.8 to 1.8.0-rc2 Upgrade error
I’ve replied to that topic and submitted a 
report
This is definitely due to the step missed during the installation, which you reported here: 1.7.8 to 1.8.0-rc2 Upgrade error
I’ve replied to that topic and submitted a report