其它可能遇到的问题是自变量类型不正确，指定的自变量名称不正确；或者服务器当机。
Other problems you may encounter are that the arguments are the incorrect type, the argument names are specified incorrectly; or the server may not be running.
自变量有时候会造成编程错误，试图对不可比较的类型进行比较。
An argument is sometimes made that it is a programming mistake to try to compare items of incommensurable types.
类型yyy中的xxx方法不适合zz z自变量。
The method XXX in the type yyy is not applicable for the arguments ZZZ.
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