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Problem with Subject import in tDndDraggableService

Hi,

Can you please look this issue, we are getting below error when we open the below link ..https://fjsc.github.io/ng2-dnd-list/index.html#/multiselection-demo

DOM7011: The code on this page disabled back and forward caching. For more information, see: http://go.microsoft.com/fwlink/?LinkID=291337
File: index.html
HTML1300: Navigation occurred.
File: index.html
TypeError: Object doesn't support property or method 'startsWith'
{
[functions]: ,
proto: { },
description: "Object doesn't support property or method 'startsWith'",
message: "Object doesn't support property or method 'startsWith'",
name: "TypeError",
number: -2146827850,
stack: "TypeError: Object doesn't support property or method 'startsWith'
at t.prototype.peekStartsWith (https://fjsc.github.io/ng2-dnd-list/main.176fa1947c34bfee946a.bundle.js:1:229751)
at t.prototype.consumeOptional (https://fjsc.github.io/ng2-dnd-list/main.176fa1947c34bfee946a.bundle.js:1:229828)
at t.prototype.parseRootSegment (https://fjsc.github.io/ng2-dnd-list/main.176fa1947c34bfee946a.bundle.js:1:227441)
at t.prototype.parse (https://fjsc.github.io/ng2-dnd-list/main.176fa1947c34bfee946a.bundle.js:1:225946)
at t.prototype.parseUrl (https://fjsc.github.io/ng2-dnd-list/main.176fa1947c34bfee946a.bundle.js:1:262020)
at t.prototype.navigateByUrl (https://fjsc.github.io/ng2-dnd-list/main.176fa1947c34bfee946a.bundle.js:1:261498)
at t.prototype.initialNavigation (https://fjsc.github.io/ng2-dnd-list/main.176fa1947c34bfee946a.bundle.js:1:258752)
at t.prototype.bootstrapListener (https://fjsc.github.io/ng2-dnd-list/main.176fa1947c34bfee946a.bundle.js:1:279895)
at Anonymous function (https://fjs"
}

On Simple Demo change the for (let i = 1; i <= 6; ++i) instead of 6 to be 400~ the ui becomes SLOWWW..

I have this issue when I drag an element the ghost shadow of the element doesnt appear on cursor in case of multik selection.