New Post: Search Query

This is the code which I am writing :

imap4X.Host = pop.gmail.com
imap4X.Port = 995
imap4X.UseSsl = true
imap4X.Connect()
imap4X.Login(username, password)
inboxMsgs = imap4X.Folders.Inbox.Search(String.Format("UID {0}:{1}", startRange, endRange))


This is the error which I am getting : The search query could not be processed

The full detail of the error is here : https://drive.google.com/file/d/0B-KkcQZM-X_rclNRcmViREtnSW8/edit?usp=sharing