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Warning: Trying to access array offset on value of type null in /home/accretio/public_html/chatserver/file_upload.php on line 14

Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /home/accretio/public_html/chatserver/file_upload.php:14 Stack trace: #0 {main} thrown in /home/accretio/public_html/chatserver/file_upload.php on line 14