improving error message

Author: crazyeng

wolframclient/cli/commands/start_externalevaluate.py

@@ -24,7 +24,7 @@ def handle(self, port=None, installpath=None, **opts):
         try:
             zmq.Context
         except ImportError as e:
-            print("%s. Please install zmq. https://zeromq.org/languages/python/" % e, file=sys.stderr)
+            print("Error importing zmq: %s. Please install zmq. https://zeromq.org/languages/python/" % e, file=sys.stderr)
             sys.stderr.flush()
             sys.exit(1)