Fatal error: Uncaught Error: Interface "ISigner" not found in E:\www\YPB2C\mod_oth\lib\aliyun-openapi-php-sdk\aliyun-php-sdk-release-test\Auth\ShaHmac256Signer.php:20 Stack trace: #0 {main} thrown in E:\www\YPB2C\mod_oth\lib\aliyun-openapi-php-sdk\aliyun-php-sdk-release-test\Auth\ShaHmac256Signer.php on line 20