错误描述：
调用EF中的FirstOrDefault()时，报错误：An error occurred while executing the command definition. See the inner exception for details.
解决方案：
一般是代码中的表或者字段无法与数据库对应导致，检查代码中的表名称或字段名称与数据库表或字段名称是否一致。
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