I have a project up and running using koolreport. Now I tried to upgrade to its version4 and run, it shows the following error."call to a member function execute() on boolean", This error is coming only in those reports, where there is parameter binding to the query. What could be wrong?

In my report there is a datatable which is filtered using (1)daterange (2)select input the select input is posing the error. 1)daterange input is binded with :start, :end input 2)select input is binded with :supervisionName This is the query in filename.php

select s.name 'Supervision Name',
            p.name        'Work Type',
            count(1)      'Task Count'
        from tablec c, tablepr p, tablesu s where
            c.project_id = p.id and
            p.project_type = s.code and
            p.project_type in (1, 2, 3, 4, 5) and
            c.istype = 1
           and c.dt_created between :start and :end 
           ".(($this->params["الوحدةالإدارية"]!=array())?"and s.name in :supervisionName":"")."   
           $sql 
        group by s.name, p.name
        ORDER BY s.code, p.id")->params(array( ":start"=>$this->params["min"],
                ":end"=>$this->params["max"],":supervisionName"=>$this->params["الوحدةالإدارية"]))
            ->pipe($this->dataStore('user_details'));

Here only this parameter is causing the error.

            $this->params["الوحدةالإدارية"]

Without this input , it seems to be working . In all reports the select input binding is causing problem. This is my select input in filename.view.php `

select2::create(array(

                "multiple"=>true,
                "name"=>"الوحدةالإدارية",
                "placeholder"=>"اختر ",
                "dataStore"=>$this->src("mysql")->query("select distinct name FROM tables $sql"),
                "attributes"=>array(
                    "class"=>"form-control"
                ),

            ));

Please check for the mistake

Thank you very much. It worked.

Oh. okay. My input was an array. Now I get it..

Since you were prompt in replying, it did'nt take much of my time.. Hats off Team koolreport for the timely support always..Keep the good work going