Remove references to `create_dir_structure`

mpsd-software-environment.py

@@ -580,14 +580,14 @@ def get_release_info(mpsd_release: str, script_dir: Path) -> Tuple[str, str, Lis
     Raises
     ------
     FileNotFoundError
-        If the release directory does not exist. Run `create_dir_structure()` first.
+        If the release directory does not exist.
     """
     # Get the info for release
     release_base_dir = script_dir / mpsd_release
     if not os.path.exists(release_base_dir):
         logging.debug(f"get_release_info({mpsd_release=}, {script_dir=}")
         raise FileNotFoundError(
-            "Release directory does not exist. Run create_dir_structure() first."
+            f"{release_base_dir} does not exist. Hint: `prepare {mpsd_release}` may fix this."
         )
     with os_chdir(release_base_dir):
         with os_chdir("spack-environments"):