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Warning: A non-numeric value encountered in /var/www/html/delivery.php on line 68

Fatal error: Uncaught InvalidArgumentException: Found 1 error while validating the input provided for the HeadObject operation: [Key] expected string length to be >= 1, but found string length of 0 in /vendor/aws/aws-sdk-php/src/Api/Validator.php:65 Stack trace: #0 /vendor/aws/aws-sdk-php/src/Middleware.php(87): Aws\Api\Validator->validate('HeadObject', Object(Aws\Api\StructureShape), Array) #1 /vendor/aws/aws-sdk-php/src/S3/S3Client.php(599): Aws\Middleware::Aws\{closure}(Object(Aws\Command), NULL) #2 /vendor/aws/aws-sdk-php/src/S3/S3Client.php(622): Aws\S3\S3Client::Aws\S3\{closure}(Object(Aws\Command), NULL) #3 /vendor/aws/aws-sdk-php/src/S3/S3Client.php(556): Aws\S3\S3Client::Aws\S3\{closure}(Object(Aws\Command), NULL) #4 /vendor/aws/aws-sdk-php/src/S3/S3Client.php(575): Aws\S3\S3Client::Aws\S3\{closure}(Object(Aws\Command), NULL) #5 /vendor/aws/aws-sdk-php/src/Middleware.php(57): Aws\S3\S3Client::Aws\S3\{closure}(Object(Aws\Command), NULL) #6 /vendor/aws/aws-sdk-php/src/S3/SSECMiddleware.php(59): Aws\Middleware::Aws\{closure}(Object(Aws\Command), NULL) #7 /vendor/aws/aws-sdk-php/src/IdempotencyTokenMiddleware.php(77): Aws\S3\SSECMiddleware->__invoke(Object(Aws\Command), NULL) #8 /vendor/aws/aws-sdk-php/src/AwsClientTrait.php(64): Aws\IdempotencyTokenMiddleware->__invoke(Object(Aws\Command)) #9 /vendor/aws/aws-sdk-php/src/AwsClientTrait.php(58): Aws\AwsClient->executeAsync(Object(Aws\Command)) #10 /vendor/aws/aws-sdk-php/src/S3/S3ClientTrait.php(363): Aws\AwsClient->execute(Object(Aws\Command)) #11 /vendor/aws/aws-sdk-php/src/S3/S3ClientTrait.php(310): Aws\S3\S3Client->checkExistenceWithCommand(Object(Aws\Command)) #12 /var/www/html/delivery.php(140): Aws\S3\S3Client->doesObjectExist('elsevier-ssrn-d...', '') #13 {main} thrown in /vendor/aws/aws-sdk-php/src/Api/Validator.php on line 65