diff --git a/flytekit/core/container_task.py b/flytekit/core/container_task.py
index 43f9ebe413..e2a3598aa4 100644
--- a/flytekit/core/container_task.py
+++ b/flytekit/core/container_task.py
@@ -144,7 +144,9 @@ def _render_command_and_volume_binding(self, cmd: str, **kwargs) -> Tuple[str, D
             if type(input_val) in [FlyteFile, FlyteDirectory]:
                 if not path_k:
                     raise AssertionError(
-                        "FlyteFile and FlyteDirectory commands should not use the syntax: {{.inputs.infile}}"
+                        "FlyteFile and FlyteDirectory commands should not use the template syntax like this: {{.inputs.infile}}\n"
+                        "Please use a path-like syntax, such as: /var/inputs/infile.\n"
+                        "This requirement is due to how Flyte Propeller processes template syntax inputs."
                     )
                 local_flyte_file_or_dir_path = str(input_val)
                 remote_flyte_file_or_dir_path = os.path.join(self._input_data_dir, k)  # type: ignore
diff --git a/tests/flytekit/unit/core/test_local_raw_container.py b/tests/flytekit/unit/core/test_local_raw_container.py
index 525d5801d3..9fb49b5b90 100644
--- a/tests/flytekit/unit/core/test_local_raw_container.py
+++ b/tests/flytekit/unit/core/test_local_raw_container.py
@@ -99,7 +99,10 @@ def flyte_file_io_wf() -> FlyteFile:
         return flyte_file_io(inputs=ff)
 
     with pytest.raises(
-        AssertionError, match="FlyteFile and FlyteDirectory commands should not use the syntax: {{.inputs.infile}}"
+            AssertionError,
+            match="FlyteFile and FlyteDirectory commands should not use the template syntax like this: {{.inputs.infile}}\n"
+                  "Please use a path-like syntax, such as: /var/inputs/infile.\n"
+                  "This requirement is due to how Flyte Propeller processes template syntax inputs."
     ):
         flyte_file_io_wf()