gen already exists but is not a source folder. Convert to a source folder or rename it.

異常提示: gen already exists but is not a source folder. Convert to a source folder or rename it. 錯誤原因: 我在導入以前的項目的時候出現了這個異常，原因是.classpath文件(這個文件在eclipse中是看不到的，必須在文件瀏覽器中才能看到並編輯)出錯，導致eclipse不能識別我的src代碼文件夾，需

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