I have one problem about filezilla. I accidentally move one folder to wrong directory, so it shows the errors when I view my website.
How can I solve it? Please help me.
Many thanks in advance for your answer.
You cannot undo, but you should understand why that happened and how to prevent that from happening again in the future.
This happened because Filezilla allows Drag-and-drop move functionality on both folders (directories) and files, very dangerous on production servers.
There is actually a feature-request for 11 years now, please add your vote to the list to get this done: https://trac.filezilla-project.org/ticket/2191
In the mean time, please consider using another software that allows the user to set this behavior as an option:
WS-FTP Pro: https://trac.filezilla-project.org/attachment/ticket/2191/ws_ftp-professional-options.gif
EDIT: Filezilla team responded (sort of) to the feature request and you can block drag and drop in the xml config file. It's better than nothing.