CiviCRM_API3_Exception: "DB Error: constraint violation" I have fixed these problem by updating one by one from 5.14.1 to 5.19.1 but now I have got new problem :) In the new version I cant install/uninstall and update any extention. I got the following error on screen:
But I realised when I click back than is the update or install/uninstall is done. But everytime when I try I get the same error. Anybody who knows the reason of the error showing ?