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Warning [2] Constant IN_MYBB already defined - Line: 30 - File: inc/plugins/newpoints.php PHP 8.1.18 (Linux)
File
Line
Function/inc/class_error.php
153
errorHandler->error
/inc/plugins/newpoints.php
30
errorHandler->error_callback
/admin/modules/config/plugins.php
526
require_once
/admin/index.php
830
require
Warning [2] Constant THIS_SCRIPT already defined - Line: 31 - File: inc/plugins/newpoints.php PHP 8.1.18 (Linux)
File
Line
Function/inc/class_error.php
153
errorHandler->error
/inc/plugins/newpoints.php
31
errorHandler->error_callback
/admin/modules/config/plugins.php
526
require_once
/admin/index.php
830
require
Warning [2] require_once(./global.php): Failed to open stream: No such file or directory - Line: 37 - File: inc/plugins/newpoints.php PHP 8.1.18 (Linux)
File
Line
Function/inc/class_error.php
153
errorHandler->error
/inc/plugins/newpoints.php
37
errorHandler->error_callback
/inc/plugins/newpoints.php
37
require_once
/admin/modules/config/plugins.php
526
require_once
/admin/index.php
830
require

your problem is from your php version , you must reduce your php version to 7.4 Or make MyBB plugin and core compatible with this version.
because mybb core and some plugins not compatible with this version .

The newpoints.php file you have in your inc/plugins directory isn't a plugin.