However v.s. nevertheless

以下是文章中的一段話:
....... However, if they are learning that language for the purpose of
communication, they will find that they are mistaken......
在這裡, However是連接副詞 , 意思是"然而",
同樣的句子, 如果把however換成副詞 nevertheless,
文法上有何錯誤?? Please help me explain it.
Thank you a lot.
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