update error message

theano/sandbox/cuda/__init__.py

@@ -432,7 +432,7 @@ def use(device,
                 if not hasattr(cuda_ndarray.cuda_ndarray, 'select_a_gpu'):
                     raise Exception(
                         "Delete your Theano cache. The automatic"
-                        " recompilation didn't worked.")
+                        " recompilation did not work.")
                 cuda_ndarray.cuda_ndarray.select_a_gpu()
                 use.device_number = active_device_number()
                 # This is needed to initialize the cublas handle.