diff --git a/infection_monkey/exploit/web_rce.py b/infection_monkey/exploit/web_rce.py
index c26d4a920..bb4613b1f 100644
--- a/infection_monkey/exploit/web_rce.py
+++ b/infection_monkey/exploit/web_rce.py
@@ -381,9 +381,9 @@ class WebRCE(HostExploiter):
                 LOG.error("Could not figure out what type of monkey server was trying to upload, "
                           "thus destination path can not be chosen.")
                 return False
-        except AttributeError:
-            LOG.error("Seems like monkey's source configuration property names changed. "
-                      "Can not get destination path to upload monkey")
+        except KeyError:
+            LOG.error("Unknown key was found. Please use \"linux\", \"win32\" and \"win64\" keys to initialize "
+                      "custom dict of monkey's destination paths")
             return False
 
     def custom_to_dropper_path(self, path):