fix: improve anndata error msg (#2743)

* feat: improve error message for anndata version mismatches

* fix: Remove mentioning of python update and only mention upgrading anndata

* Update server/data_anndata/anndata_adaptor.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Timmy Huang <tihuan@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

server/data_anndata/anndata_adaptor.py

@@ -173,13 +173,24 @@ class AnndataAdaptor(DataAdaptor):
             )
         except MemoryError:
             raise DatasetAccessError("Out of memory - file is too large for available memory.")
-        except Exception:
+        except Exception as e:
             import traceback
+            error_msg = str(e)
+
+            # IMPROVEMENT: Broadly catch ANY version incompatibility
+            if "No read method registered" in error_msg and "IOSpec" in error_msg:
+                message = (
+                    "Error loading file: This H5AD file uses a newer internal format that "
+                    "your version of 'anndata' cannot read.\n"
+                    f"The specific error was: {error_msg}\n"
+                    "Please upgrade anndata in your environment (pip install --upgrade anndata)."
+                )
+            else:
+                message = (
+                    "File not found or is inaccessible. File must be an .h5ad object. "
+                    "Please check your input and try again."
+                )
 
-            message = (
-                "File not found or is inaccessible. File must be an .h5ad object. "
-                "Please check your input and try again."
-            )
             if self.server_config.app__verbose:
                 message += f"\n{traceback.format_exc()}"
             raise DatasetAccessError(message)