Bad system file sequence number.

损坏的系统文件顺序编号。

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The first argument is a file sequence number, which will be used to form the result filename.

第一个参数是一个文件序列号，用来组成结果文件名。

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Each migration file starts with a sequence number one greater than the previous migration file, and that number corresponds to the schema version kept in a special table in the database.

每个移植文件开始的序列数都比前面的移植文件大，并且该数字符合位于数据库特殊表中的方案版本。

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