I wrote in the other thread of you (why did you open a new one about the same topic?), that you need the $app parameter to set the app, which has registered the schema.
If you post code, please enclose it in 3 single back-ticks: ```
$this->db = $GLOBALS[‘egw’]->db;
$app = 'my-app-name';
‘store_name’ => ‘test’
), false, __LINE__, __FILE__, $app);
The above will of cause only work, IF the app registered the schema, as described in example app.
I recommend you start with the example app, and step by step modify it to your needs / requirements.