SMF 2.1 RC3 md5_file and array to string conversion error

[-Rock Lee-]

I'm not sure if it's an error on my server or something specific, but I have these errors repeatedly.

In the file ShowAttachments.php in line 156 it appears that:

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$file['filePath'] = !file_exists($file['filePath']) && isset($filePath['extension']) ? substr($file['filePath'], 0, -(strlen($filePath['extension']) + 1)) : $file['filePath'];
$file['etag'] = '"' . md5_file($file['filePath']) . '"';

In the file Subs.php in line 4456 it appears that:

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// Are we using multiple directories?
if (is_array($modSettings['attachmentUploadDir']))
$path = $modSettings['attachmentUploadDir'][$dir];

else
$path = $modSettings['attachmentUploadDir'];
return $path . '/' . $attachment_id . '_' . $file_hash . '.dat';
}

I am trying a conversion from 2.0 to 2.1 (It is my own server of tests) and it seems all the other users I had no problem with only some specific ones, it seems that it cannot convert or read the file correctly... more info PHP: 7.4.10, MySQL version: 10.6 and Server Version: Apache.


Regards!