Can’t create a new XMLDB file
The Moodle XMLDB plugin does some checks of the db/ folder in your plugin to ensure it has read/write access before allowing certain permissions (e.g. create and load). If it doesn’t find this, the text will appear but it won’t be a hyperlink.
Have a look in:
admin/tool/xmldb/actions/main_view/main_view.class.php
For example for the create button it will have:
// The create button
if ($dbdir->path_exists &&
!file_exists($key . '/install.xml') &&
is_writeable($key)) {
So the db directory needs to exist and be writable by the user running the Moodle instance (e.g. if using apache the user that apache runs as).
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