fixing

python_modules/dagster/dagster/_core/definitions/schedule_definition.py

@@ -234,8 +234,8 @@ def resources(self) -> Resources:
         """Mapping of resource key to resource definition to be made available
         during schedule execution.
         """
-        if self._resources_container.has_resources:
-            return self._resources_container.get_resources()
+        if self._resources_container.has_been_accessed:
+            return self._resources_container.get_already_accessed_resources()
 
         instance = self.instance if self._instance or self._instance_ref else None
         return self._resources_container.make_resources("build_schedule_context", instance=instance)

python_modules/dagster/dagster/_core/execution/context/dual_state_context.py

@@ -58,14 +58,12 @@ def call_on_exit(self) -> None:
     def call_on_del(self) -> None:
         self._exit_stack.close()
 
+    @property
     def has_been_accessed(self) -> bool:
-        return self._resources is not None
-
-    def has_resources(self) -> bool:
         return bool(self._resources)
 
-    def get_resources(self) -> Resources:
-        assert self.has_resources
+    def get_already_accessed_resources(self) -> Resources:
+        check.invariant(self.has_been_accessed)
         return check.not_none(self._resources)
 
     def make_resources(