no element is specified to initialize perfectscrollbR

It seems that you are trying to initialize a PerfectScrollbar but you haven't specified any element to apply it to. You need to pass the element to the PerfectScrollbar constructor as an argument.

Here is an example code snippet:

// Get the element you want to apply the scrollbar to
const element = document.getElementById('my-element');

// Initialize the scrollbar
const ps = new PerfectScrollbar(element);

Make sure you have also included the PerfectScrollbar library in your project and have imported it correctly.