Sharepoint online - copy files programmatically

Hello,

I'm working wiht Sharepoint Online, trying to copy a file (and his metadata) from one site to another in the same site collection, I'm using MoveCopyUtil:

            using (SP.ClientContext lContext = ClientContextAuth(xsURLOrigen))
            {
                SP.MoveCopyOptions lOptions = new SP.MoveCopyOptions();
                lOptions.ResetAuthorAndCreatedOnCopy = false;
                SP.MoveCopyUtil.CopyFile(lContext, xsURLOrigen, xsURLDestino,true, lOptions);
                lContext.ExecuteQuery();
            }

This throw the next error: "Value does not fall within the expected range."

any help will be appreciated, thanks!
Mauricio.