Problem with sharepoint farm backup

Hi,
My environment details are:

SharePoint 2010 SP1
Two WFE
TSM for sharepoint agent 6.1.5


I used TSM for sharepoint for sharepoint backup.  

TSM agent is installed on 2nd WFE. When i backup sharepoint from  WFE 2 it  throw an exception
"Error:There is no agent installed for server: WFE1"

Previously i installed TSM agent on WEF1 but now i have completely uninstall tsm agent from web1. Please guide what is the issue and how to fix it.

thx