Getting Error : Message: String could not be parsed as XML

[kunallibra]

I followed the installation steps and when I execute the program, it gives me the following error:-

An uncaught Exception was encountered

Type: Exception

Message: String could not be parsed as XML

Filename: /Applications/XAMPP/xamppfiles/htdocs/application/libraries/Nab_library.php

Line Number: 129

Backtrace:

File: /Applications/XAMPP/xamppfiles/htdocs/application/libraries/Nab_library.php
Line: 129
Function: __construct

File: /Applications/XAMPP/xamppfiles/htdocs/application/libraries/Nab_library.php
Line: 76
Function: payment_process

File: /Applications/XAMPP/xamppfiles/htdocs/application/controllers/Pay_now.php
Line: 77
Function: pay_now

File: /Applications/XAMPP/xamppfiles/htdocs/index.php
Line: 315
Function: require_once