Failed to load the resource. the server responds with a status of 404(Not Found)

when i trying to load the page and redirecting from this form to another all are working fine. but after redirection happens when i click on Back button of the browser.
it showing normally and all the functionality is working fine. but in console it showing the above error. after clicking on back button at loading of the previous form.
why it happens. it is not affecting any functionality. but i want to clear that error.
                                                           http://localhost:49826/__browserLink/requestData/5671a34d6fb34b938d848d10e5c150b

Here in page load i am adding the linkbutton controls are as the postback controls to the updatepanel dynamically. is their effecting to get thi ...