Fix tests

gns3server/utils/application_id.py

@@ -15,7 +15,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from gns3server.compute.compute_error import ComputeError
+from gns3server.controller.controller_error import ControllerError
 
 import logging
 log = logging.getLogger(__name__)
@@ -44,4 +44,4 @@ def get_next_application_id(projects, computes):
         application_id = (pool - used).pop()
         return application_id
     except KeyError:
-        raise ComputeError("Cannot create a new IOU node (limit of 512 nodes across all opened projects using the same computes)")
+        raise ControllerError("Cannot create a new IOU node (limit of 512 nodes across all opened projects using the same computes)")