DataTables warning: table id=table_name - Invalid JSON response.

Hi all,

since one week I get the following error message in one page what I never changed:
DataTables warning: table id=table_name - Invalid JSON response.

I checked all files and all forum but I don´t find why this error appears.

Today I look at the page resources and I saw that the following error appears in the file table.bookings_dm.php

<br />
<b>Fatal error</b>: Uncaught Error: Call to undefined function number() in /php/Editor/Field.php:593
Stack trace:

0 /php/Editor/Editor.php(803): DataTables\Editor\Field->optionsExec(Object(DataTables\Database)) 1 /php/Editor/Editor.php(555): DataTables\Editor->_get(NULL, Array) 2 /table.bookings_dm.php(120): DataTables\Editor->process(Array) 3 {main} thrown in <b>/php/Editor/Field.php</b> on line <b>593</b><br />

Can someone help me please? Show me a way because I really have not changed anything in the files.

Best