调用bash build_cross_groups.sh时遇到报错[ERROR] BCOS-P2P port 30300 is not available. Are there any other blockchain is running?按照往期8545报错进行修改，依然报错

**BUG描述**
报错[ERROR] BCOS-P2P port 30300 is not available. Are there any other blockchain is running?

**重现方式**
重现 BUG 的操作步骤。

执行脚本 bash build_cross_groups.sh.'

**预期结果**
报错[ERROR] BCOS-P2P port 30300 is not available. Are there any other blockchain is running?

**环境**
 - 操作系统: [ Ubuntu]
 - 版本 [20.04]

**更多信息**
按照往期8545报错进行修改，依然报错
