diff --git a/cubes/server/blueprint.py b/cubes/server/blueprint.py
index 1c3d3148..93b721e0 100644
--- a/cubes/server/blueprint.py
+++ b/cubes/server/blueprint.py
@@ -4,7 +4,7 @@
 import traceback
 from collections import OrderedDict
 
-from flask import Blueprint, Response, request, g, current_app, safe_join, make_response
+from flask import Blueprint, Response, request, g, current_app
 from flask import render_template, redirect
 
 from ..workspace import Workspace, SLICER_INFO_KEYS
diff --git a/examples/hello_world/prepare_data.py b/examples/hello_world/prepare_data.py
index 4737bd3f..37671a28 100644
--- a/examples/hello_world/prepare_data.py
+++ b/examples/hello_world/prepare_data.py
@@ -4,6 +4,12 @@
 
 from sqlalchemy import create_engine
 from cubes.tutorial.sql import create_table_from_csv
+from pathlib import Path
+
+
+cur_folder = Path(__file__).parent
+csv_path = cur_folder / 'data.csv'
+sqlite_path = cur_folder / 'data.sqlite'
 
 # 1. Prepare SQL data in memory
 
@@ -11,10 +17,10 @@
 
 print("preparing data...")
 
-engine = create_engine('sqlite:///data.sqlite')
+engine = create_engine(f'sqlite:///{sqlite_path}')
 
 create_table_from_csv(engine,
-                      "data.csv",
+                      str(csv_path),
                       table_name=FACT_TABLE,
                       fields=[
                             ("category", "string"),