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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/chingssecret/application/vendor/facebook/graph-sdk/src/Facebook/Authentication/OAuth2Client.php
Line: 146
Function: http_build_query

File: /var/www/html/chingssecret/application/vendor/facebook/graph-sdk/src/Facebook/Helpers/FacebookRedirectLoginHelper.php
Line: 128
Function: getAuthorizationUrl

File: /var/www/html/chingssecret/application/vendor/facebook/graph-sdk/src/Facebook/Helpers/FacebookRedirectLoginHelper.php
Line: 142
Function: makeUrl

File: /var/www/html/chingssecret/application/libraries/Facebook.php
Line: 82
Function: getLoginUrl

File: /var/www/html/chingssecret/application/views/footer.php
Line: 150
Function: login_url

File: /var/www/html/chingssecret/application/controllers/Custom404.php
Line: 19
Function: view

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