better error message cc @IgorWounds

openbb_platform/core/openbb_core/app/model/obbject.py

@@ -278,11 +278,37 @@ class OBBject(Tagged, Generic[T]):
             del results["index"]
         return results
 
+    @staticmethod
+    def _get_show_error_message(route: str) -> str:
+        """Return error message for show method."""
+        charting_installed: bool = False
+        messages = {
+            "not_installed": "The charting extension is not installed.",
+            "not_found": "Chart not found. Please use `chart=True` argument or the accessor's methods to create a chart.",
+            "not_implemented": f"The route `{route}` does not have a charting function.",
+        }
+        try:
+            # pylint: disable=import-outside-toplevel
+            from openbb_charting import Charting
+
+            charting_installed = True
+        except ImportError:
+            charting_installed = False
+
+        if not charting_installed:
+            message_key = "not_installed"
+        else:
+            has_view = route.replace("/", "_")[1:] in Charting.functions()
+            message_key = "not_implemented" if not has_view else "not_found"
+
+        return messages[message_key]
+
     def show(self, **kwargs: Any) -> None:
         """Display chart."""
         # pylint: disable=no-member
         if not self.chart or not self.chart.fig:
-            raise OpenBBError("Chart not found.")
+            error_message = self._get_show_error_message(self._route)
+            raise OpenBBError(error_message)
         show_function: Callable = getattr(self.chart.fig, "show")
         show_function(**kwargs)