[Dreamweaver] I get this message whenever I send a file after changing it

Hello
i have this problem with Dreamweaver :
whenever i try to put a file (Style.css) in the server I get this message :
"Style.css has changed on the remote server since your last get or put. Putting it may overwrite changes to the file. Do you wish to put the file anyway?"
And though I'm the only person having access to this server...
If someone would help me...

Did i post this question in the wrong part in the forum ?

No its just only been a day and you aren't being patient. Do you upload files from more than one place e.g. at work, then at home? Are you and your server in the same time zone? Its possible their time shows up on when the file was modified and since it doesn't match your time it says its different. You could always disable syncronization if you want to.