Good evening all,

I am updating a small site from Craft 2 to 3, and after following the instructions in the documents, I loaded up the backend of my site and was greeted with the install screen.

I know that this typically means that the DB_TABLE_PREFIX is improperly set, but I triple-checked and I'm 99% certain that it's correct. I double-checked with my Craft 2, which looks like

// The prefix to use when naming tables. This can be no more than 5 characters.
    'tablePrefix' => 'craft',

And matched it to my .env file:

# The prefix that should be added to generated table names (only necessary if multiple things are sharing the same database)

I also checked for a craft_info table, and that is present. The version listed in the version column is 2.9.2, if that makes a difference.

I am unable to login to my admin panel, or view my website now. I get the following when viewing my website:

Database Connection Error – craft\errors\DbConnectException
Craft CMS can’t connect to the database with the credentials in config/db.php.
Caused by: Database Exception – yii\db\Exception

Any help is greatly appreciated!


1 Answer 1


Does the table prefix value in you .env file need to be in quotes? eg

  • However - this sounds to me more like an issue with the credentials. Generally if the table prefix value is wrong Craft will just think it is not installed and try a new installation … Sep 15, 2020 at 6:43
  • Thanks for the response. As noted above, the table prefix between Craft 2 and 3 is the same. The prefix wrapped in quotes wasn't the solution.
    – Shad
    Sep 15, 2020 at 15:16
  • In Craft 3 I think you need to add the underscore for the prefix value so Craft 2 is craft but for Craft 3 would be craft_ Sep 16, 2020 at 16:05
  • Tried that yesterday, but still no luck. Thanks for checking back in though!
    – Shad
    Sep 16, 2020 at 19:15
  • When the error message reads "can't connect to the database with the credentials" then you have a permissions error. Its not even reaching the db server thus it cannot be a problem with the table prefixes. In a .env file, you do not need to use quotes unless there are spaces or other "special chars" in your term.
    – MisterMike
    Feb 12, 2021 at 8:30

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