fix: exception text (#1750)

src/kili/services/asset_import/__init__.py

@@ -50,7 +50,7 @@ def import_assets(  # pylint: disable=too-many-arguments
     importer_params = (kili, project_params, processing_params, logger_params)
 
     if input_type not in importer_by_type:
-        raise NotImplementedError(f"There is no imported for the input type: {input_type}")
+        raise NotImplementedError(f"There is no importer for the input type: {input_type}")
     if input_type != "IMAGE" and any(asset.get("multi_layer_content") for asset in assets):
         raise ImportValidationError(
             f"Import of multi-layer assets is not supported for input type: {input_type}"