method error

例句：

1. 1.The experiment was flawed due to a method error.
   实验由于方法错误而存在缺陷。
2. 2.The software had an error in its method.
   软件在其方法上出现了错误。
3. 3. The engineer made a mistake in his method.
   工程师在方法上犯了一个错误。