1. Cause of error: the password of the database connection is wrong, so it can be modified
I use the Nacos registry to check whether the password is correct in the configuration file application.properties
2. Reasons for error reporting ： The access port is occupied. Please refer to this document to release the port
https://blog.csdn.net/weixin_ 56859779/article/details/119204459?spm=1001.2014.3001.5502
3. Cause of error: the provider of remote call, the port of application.yml in the configuration file is wrong, and it is changed to the access port
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