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I have been looking for a solution on the internet before asking for your help here.

My drupal site was working fine since yesterday when I create a calendar event chain ( this is a custom module) and i clicked "save", then this error appeared:

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I have checked from the recent log message and found this

enter image description here

I dont know what have happened since I cleared all the queuing using queue manager. The funny thing is that if I use the backup database, which had backed up before this error happened from the production site to my localhost, then everything works fine and I am able to create the even and save it. So is there any problem with the database ? I wish i could use the backup database on my production site ? :/

Thank you for your replies.

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  • looks like a problem with your custom entity. to find the error, trace it, see here drupal.stackexchange.com/questions/32233/… or use drupal.org/project/past
    – rémy
    May 19, 2016 at 20:13
  • Thank you very much. Following those links above. I am able to find a solution for this error: 'drush sqlq 'update system set schema_version=7100 where name="redirect"' drush updb -y'. Source link
    – Tony
    May 20, 2016 at 7:22

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