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When we add product under women catalog when we want to change the product to offline / change to out of stock; when we try to cancel the order; not success, and showed the below sentence.. How to solve it ? Please.

Warning: is_file() expects parameter 1 to be a valid path, string given in /var/www/html/lib/internal/Cm/Cache/Backend/File.php on line 508

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I have solved it by removing the cache

rm -rf var/cache var/log var/page_cache var/view_preprocessed

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