python - Flask upload cannot find directory in server -

i have problem flask upload in local machine code working when upload code server using apache show error

ioerror: [errno 2] no such file or directory: u'app/static/avatars/khuon.s.png'

code :

allowed_extensions                  =   set(['png', 'jpg', 'jpeg', 'gif']) app.config['upload_folder']         =   'app/static/avatars' app.config['max_content_length']    =   1 * 600 * 600  def allowed_file(filename):     return '.' in filename , filename.rsplit('.', 1)[1] in allowed_extensions  @app.route('/user/profile', methods=['get', 'post']) def upload_profile():      if request.method == 'post':          file = request.files['file']         if file , allowed_file(file.filename):             filename = secure_filename(file.filename)              file.save(os.path.join(app.config['upload_folder'], filename))          else:              flash("file extension not allow.")             return redirect(url_for('upload_profile', upload='error'))      return render_template("profile.html") 

ok, in upload.py like

import os absolute_path = os.path.abspath(upload_folder+file_name) 

os.path.abspath returns absolute path given relative path.