I have installed in my localhost a clean version of phpBB 3.0.12, everything worked fine, but when you update the database me appeared this message.

Updating database to latest stable release

Database type :: mysqli
Previous version :: 3.1.0-dev
Installed Schema: \phpbb\db\migration\data\v310\notifications_cron; Time: 0.05 seconds
Installed Data: \phpbb\db\migration\data\v310\notifications_cron; Time: 0.25 seconds
Installed Schema: \phpbb\db\migration\data\v310\notifications_schema_fix; Time: 0.57 seconds
Installed Data: \phpbb\db\migration\data\v310\notifications_schema_fix; Time: 0.08 seconds
Installed Schema: \phpbb\db\migration\data\v310\notification_options_reconvert; Time: 0.08 seconds
Installed Data: \phpbb\db\migration\data\v310\notification_options_reconvert; Time: 0.17 seconds
The migration "\phpbb\db\migration\data\v310\alpha1" is not fulfillable, missing migration "\phpbb\db\migration\data\v310\plupload".

In the attached are the steps performed