Accessing file from FTP in VB.NET - The remote server returned an error: (550) File unavailable (e.g., file not found, no access)

I am trying to use FTPWebRequest Rename method, below is my code snippet.

 Dim str1 As String = "ftp://slsdevvs01.am.cdkgroup.net/%2fDataTrans/%2f" Dim str2 As String = "Archive/Outbound/" Dim str3 As String = "CDK_IS_20220603_092921.CSV" Dim str4 As String = "Old/CDK_IS_20220603_092921.CSV" Dim cdkCommandFTP As New NetworkCredential(My.Settings.FTPUser, My.Settings.FTPPass)                requestFTP = DirectCast(System.Net.WebRequest.Create(str1 & str2 & str3), FtpWebRequest) requestFTP.Credentials = cdkCommandFTP requestFTP.Method = WebRequestMethods.Ftp.Rename requestFTP.RenameTo = str4 requestFTP.GetResponse()

When i am trying to run my application i am getting the below error after GetResponse()

The remote server returned an error: (550) File unavailable (e.g.,file not found, no access) rename

I have passed the working credentials and the file also exists in the location