CUDAFE problem : what's going on?

Hello everyone, I have installed the CUDA SDK 3.0 Toolkit and I recompiled successfully my GPU application. But today re-building the solution did not succeed:I got the following message

‘cudafe’ is not recognized as an internal or external command,
1>operable program or batch file.
1>Project : error PRJ0019: A tool returned an error code from “Compiling with CUDA Build Rule…”

what’s going on?

Help is much appreciated

thanks