fix: fix error directory path

src/plugin/error/__init__.py

@@ -0,0 +1,15 @@
+import inspect, pkgutil
+
+__all__ = []
+
+for loader, module_name, is_pkg in  pkgutil.walk_packages(__path__):
+    module = loader.find_module(module_name).load_module(module_name)
+    if hasattr(module, '__all__'):
+        for target in getattr(module, '__all__'):
+            globals()[target] = getattr(module, target)
+            __all__.append(target)
+    else:
+        for name, object in inspect.getmembers(module):
+            if inspect.isclass(object) or inspect.isfunction(object):
+                globals()[name] = object
+                __all__.append(name)

src/plugin/error/custom.py

@@ -0,0 +1,4 @@
+from spaceone.core.error import ERROR_BASE
+
+class ERROR_VULNERABLE_PORTS(ERROR_BASE):
+    _message = 'Vulnerable port option settings are incorrect. : {vulnerable_ports}'