当我尝试为magento安装新扩展程序时，我收到以下错误
为了解决这个问题，我需要做些什么？
Problem 1
- symfony/finder v3.4.1 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.30-0ubuntu0.16.04.1) overriden by "config.platform.php" version (7.0.0) does not satisfy that requirement.
- symfony/finder v3.4.1 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.30-0ubuntu0.16.04.1) overriden by "config.platform.php" version (7.0.0) does not satisfy that requirement.
- symfony/finder v3.4.1 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.30-0ubuntu0.16.04.1) overriden by "config.platform.php" version (7.0.0) does not satisfy that requirement.
- Installation request for symfony/finder == 3.4.1.0 -> satisfiable by symfony/finder[v3.4.1].