This problem is related to the base-coded sitefile class.crypto.phpclass CryptoOpenSSLfunction decrypt($ciphertext)it must be replaced$iv = substr($ciphertext, 0, $ivlen);$ciphertext = substr($ciphertext, $ivlen);to:$iv = mb_substr($ciphertext, 0, $ivlen,'ASCII');$ciphertext = mb_substr($ciphertext, $ivlen,1000,'ASCII');