与同步调用类似，InvalidSymbolException指示请求已到达服务提供程序，该提供程序抛出业务异常，指示符号无效。
Similar to a synchronous invocation, InvalidSymbolException indicates that the request has reached the service provider, which has thrown a business exception stating that the symbol is invalid.
我被搞懵了，接下来我能记得的，就是看见一些数字符号啥的出现了，最后出现一个错误信息，像是'文件格式无效'什么的。
The next thing I know, all these Numbers and symbols show up and I get an error message saying 'invalid file format' or something.
服务提供程序然后抛出业务异常，指示提供的符号无效。
The service provider then throws a business exception stating that the symbol supplied is invalid.
进行此调用后，符号编写器将无效，无法进行进一步的更新。
After this call, the symbol writer becomes invalid for further updates.
如果百分比符号之后的字元序列是无效的，则会将百分比符号置换成%25。
If the character sequence following a percent is not valid, the percent is replaced by % 25.
如果百分比符号之后的字元序列是无效的，则会将百分比符号置换成%25。
If the character sequence following a percent is not valid, the percent is replaced by % 25.
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