Could you please post me the full trace

Could you please give me the screenshoot of quickstart

I mean the screenshot of browser when you run the quickstart example. The screen that shows error

Dashboard requires php session to be enabled. It could be the deep cause of this issue. Could you please check if session in your php is enabled.

That's strange. Let try to debug to see what cause issue. Could you please go to comment out line 136-153 of vendor\koolreport\dashboard\Application.php

        try {
            $this->init();
            if ($this->fireEvent("Running")===false) {
                return;
            }
            $response = $this->handle($this->request);
            $this->fireEvent("Run");
        } catch (\Throwable $exception) {
            $this->request->route("App/Exception")->params([
                "exception"=>$exception
            ]);
            $response = Response::create();
            if ($this->request->isFirstRequest()) {
                $response->html($this->view());
            } else {
                $response->merge($this->pages["Exception"]->handle($this->request));
            }
        }

and put only:

            $this->init();
            if ($this->fireEvent("Running")===false) {
                return;
            }
            $response = $this->handle($this->request);
            $this->fireEvent("Run");

Let see if the real error is showing.

That's great to find out what went wrong. Is it solved now?

You are welcome :)