[DroidPocketMine] Server is starting...
[DroidPocketMine] Server was started.
[Server] [36m13:14:08[0m [37;1m[NOTICE] PocketMine-MP hasn't been tested with PHP > 5.4.13
[Server] [0m[36m13:14:08[0m [31;1m[ERROR] Unable to find the GMP extension.
[Server] [0m[36m13:14:08[0m [31;1m[ERROR] Please use the installer provided on the homepage.
[Server] [0m
[DroidPocketMine] Server was stopped.
这是什么回事?