I am having some troubles making field types data tables work, could I have some help?

aie-man

Hello everyone,
I am having some troubles making field types data tables work.
I would like for the table to have no entries to begin with.
Running this with my local server, I get this error :

DataTables warning: table id=1 - SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected

With my PHP log files, I tried to trace the error and I get this message :

PHP Fatal error: Call to a member function insertId() on null in
/.../.../Editor/Editor.php on line 1135

I am a beginner in PHP/Javascript programming, so please be understanding.

Thanks in advance,
Aymane

https://editor.datatables.net/examples/simple/fieldTypes.html