An error when overwriting remote files

I have a directory that is owned by root:root and has a 757 permission. I login using kaysho:whatever to winscp and I can copy a file from local dir to remote dir normally, but when the file is already in the remote dir and I try to overwrite it, I receive

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what could be wrong ?

Thanks
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Duplicate post:
https://winscp.net/forum/viewtopic.php?t=11900