Foreigners often make some strange mistakes in Chinese when they study the most difficult language--- ---Chinese. We try to analyze typical sentences to correct these errors.

          Wǒ shuō tā le, xià zhōu lái.
False: 我说她了，下周来。
          Wǒ ɡàosu tā le, xià zhōu lái.
True: 我告诉她了，下周来。

可以理解为谓语动词后边有两个宾语，一个指人（“他”），一个是一件事（“下星期学弟第三本书”）。应该把“说”改为“告诉”。
The predicate verb here may be considered to have two objects, with one referring to the person(他)；The other referring to the event（下周来）. We replace 说 by 告诉.