求助！There was an unexpected error (type=Internal Server Error, status=500).

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Whitelabel Error PageThis application has no explicit mapping for /error, so you are seeing this as a fallback.Thu Jul 30 10:49:20 CST 2020There was an unexpected error (type=Internal Server Error, status=500).nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for getUserCount ### Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for getUserCountidea中mysql也都配置好了，都是按照教程写的配置，为啥还是报错