diff --git a/tap_google_sheets/tap.py b/tap_google_sheets/tap.py
index 4073497..8b357a7 100644
--- a/tap_google_sheets/tap.py
+++ b/tap_google_sheets/tap.py
@@ -169,8 +169,7 @@ def get_first_line_range(stream_config):
                 start_column, start_line, end_column, end_line = result.groups("")
                 break
         else:
-            # This should never happen, regex should be validated by the jsonschema
-            raise ConfigValidationError("Invalid range format")
+            raise ConfigValidationError("Invalid range format, please use valid A1 notation.")
         if start_line and end_line:
             line_number = str(min(int(start_line), int(end_line)))
         else: