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[07-Aug-2021 11:27:18 Africa/Khartoum] PHP Notice: Trying to get property 'category_id' of non-object in /var/www/html/bookStorerRestfulAPI/api/book/index.php on line 21
[07-Aug-2021 11:27:31 Africa/Khartoum] PHP Notice: Trying to get property 'category_id' of non-object in /var/www/html/bookStorerRestfulAPI/api/book/index.php on line 21