Error IOMS installation ended prematurely

For one of my client i need to install IOMS package on there server but when i try to install this on there server the following error message pops up. Can any one tell me why this is happening and what do i need to do?
Fatal Error
Installation ended prematurely because of an error.
OK
Installer Information
The Enterprise .NET SDK feature of BusinessObjects Enterprise
XI 3.1 must be installed before installing this software.
OK
IOMS installation error: .net sdk failure
