Getting error while connecting to HPALM database through C# project:Retrieving the COM class factory for component with CLSID

I have a web application which has multiple tabs with connectivity to different different database. One tab hac connection with HPALM database. I have moved the project to different machine. all tab was working fine on old machine. In new machine I am getting Retrieving the COM class factory for component with CLSID {C5CBD7B2-490C-45F5-8C40-B8C3D108E6D7} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)) error only for the tab which has connection with HPALM.