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PHP Notice: Trying to get property 'id' of non-object in E:\congress_app\src\pages\event\contribution.php on line 13 PHP Warning: Creating default object from empty value in E:\congress_app\src\pages\event\contribution.php on line 13 PHP Notice: Undefined property: stdClass::$uuid in E:\congress_app\src\pages\event\contribution.php on line 15 PHP Warning: unpack(): Type H: not enough input, need 4, have 0 in E:\congress_app\src\lib\Utils.php on line 165 PHP Warning: join(): Invalid arguments passed in E:\congress_app\src\lib\Utils.php on line 165 PHP Notice: Undefined property: stdClass::$session_uuid in E:\congress_app\src\pages\event\contribution.php on line 16 PHP Warning: unpack(): Type H: not enough input, need 4, have 0 in E:\congress_app\src\lib\Utils.php on line 165 PHP Warning: join(): Invalid arguments passed in E:\congress_app\src\lib\Utils.php on line 165 PHP Notice: Undefined property: stdClass::$id in E:\congress_app\src\pages\event\contribution.php on line 18