IMAP Server Alert on MS-Outlook 2010

I have a problem in Microsoft Outlook 2010. Whenever I tried to open it or click on send/receive options, it doesn’t work and shows the error message
"Your IMAP server wants to alert you the following: Can’t read attachment for message 150". When I have to work with Microsoft Outlook 2010 each time this message appears ending with different numbers like 150, 68,252.
Due to this problem I am unable to work on it.
Kindly give me tips to get rid of this problem
