Eriky

If you get this error with MediaWiki (or any other software) you should look at the properties of your table structure. Most probable is that an “auto_increment” is missing. This problem took me quite a while to find, especially because of lots of people on the web come up with the weirdest explanations and solutions, like simply reinstalling and re-importing the data. Not fun if you are in a hurry and have a table with 7.5 million text files.