in stats model constructin stats model construct

A PHP Error was encountered

Severity: Warning

Message: Undefined array key "Fall"

Filename: models/Vichill_model.php

Line Number: 255

Backtrace:

File: /home/whistc5/public_html/application/models/Vichill_model.php
Line: 255
Function: _error_handler

File: /home/whistc5/public_html/application/models/Teams_model.php
Line: 303
Function: getBrackets

File: /home/whistc5/public_html/application/models/Stats_model.php
Line: 37
Function: getbrackets

File: /home/whistc5/public_html/application/controllers/Stats.php
Line: 38
Function: setProperties

File: /home/whistc5/public_html/index.php
Line: 317
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/whistc5/public_html/application/models/Stats_model.php:24)

Filename: core/Common.php

Line Number: 564

Backtrace:

An uncaught Exception was encountered

Type: TypeError

Message: Vichill_model::getBrackets(): Return value must be of type array, null returned

Filename: /home/whistc5/public_html/application/models/Vichill_model.php

Line Number: 255

Backtrace:

File: /home/whistc5/public_html/application/models/Teams_model.php
Line: 303
Function: getBrackets

File: /home/whistc5/public_html/application/models/Stats_model.php
Line: 37
Function: getbrackets

File: /home/whistc5/public_html/application/controllers/Stats.php
Line: 38
Function: setProperties

File: /home/whistc5/public_html/index.php
Line: 317
Function: require_once