RealView error message for lpc213x

Hello;

I have recently downloaded and installed RealView v3.70
in order to work on philips' code bundle for lpc213x.I opened one of code bundles projects included and attempted to build it to figure out if it works.But keil refused to build it saying "Error: failed to execute 'C:\Keil\ARM\BIN\AA' ".

I have worked on embedded systems but a real newbee in Arm cores so please help me out..

Thanks in advance