Error massage when you accessing the word press (WP) admin login page

Warning: Cannot modify header information – headers already sent by (output started at C:\inetpub\vhosts\yourdomainname.com\httpdocs\wp-content\themes\wpaire\iepngfix\iepngfix.php:201) inC:\inetpub\vhosts\yourdomainname.com\httpdocs\wp-includes\pluggable.php on line 866

Cause of the error:
This error has usually come because there are spaces, new blank lines or any other garbage
before an opening  < ?php     tag or after a closing   ?> tag

Solution :
Step1. As this error massage has coming when any blank space in the starting or end of the PHP page
from wp-config.php

Step2 Please find the files with the extra lines, look at the error message itself, as it will tell you exactly which file is causing the issue. Please see the error path
C:\inetpub\vhosts\yourdomainname.com\httpdocs\4\wp-content\themes\wpaire\iepngfix\iepngfix.php:201)
Now please open the iepngfix.php and see if any blank line in the php file then please delete it

How to do :
If you install your application in the linux server with cpanel
thenplease follow the below steps for solving the issue
login to your cPanel account==>click on file manager
==>click on path till you had reach Home/username/public_html/wp-content/themes/wpaire\iepngfix\iepngfix.php
==>open the file iepngfix.php in code editor
Fine the blank space in the beginning or before ending of the page.

If you install your application in the window server with plesk control panel
==>Login to your plesk panel ==> Click on file manager
==>and reach the \yourdomainname.com\httpdocs\wp-content\themes\wpaire\iepngfix\iepngfix.php
==>you can open in their or you can download this file through FTP and make the changes and re upload it.

If you install your application in the window server with website panel
==>Login to your plesk panel ==> Click on file manager
==>click on domain folder==>then wwwroot
==>then reach the \yourdomainname.com\wwwroot\wp-content\themes\wpaire\iepngfix\iepngfix.php
==>open the file iepngfix.php through click on right side small edit icon
and make the necessary changes as define at the above steps

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