A PHP Error was encountered

Severity: 8192

Message: http_build_query(): Passing null to parameter #2 ($numeric_prefix) of type string is deprecated

Filename: Authentication/OAuth2Client.php

Line Number: 146

Backtrace:

File: /var/www/html/application/third_party/facebook-php-graph-sdk/Authentication/OAuth2Client.php
Line: 146
Function: http_build_query

File: /var/www/html/application/third_party/facebook-php-graph-sdk/Helpers/FacebookRedirectLoginHelper.php
Line: 128
Function: getAuthorizationUrl

File: /var/www/html/application/third_party/facebook-php-graph-sdk/Helpers/FacebookRedirectLoginHelper.php
Line: 142
Function: makeUrl

File: /var/www/html/application/libraries/Facebook.php
Line: 135
Function: getLoginUrl

File: /var/www/html/application/controllers/Login.php
Line: 31
Function: login_url

File: /var/www/html/index.php
Line: 315
Function: require_once

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