I am using odoo v10 on a local windows 10 system and in the cloud. On both installations i have the same problem with massmailing. the console shows 404 error when loading images

What is going wrong here?

Failed to load resource: the server responded with a status of 404 (NOT FOUND)http://odoo-10.pyproject.ninja/web/image/mass_mailing.s_default_image_block_two_cols_2 Failed to load resource: the server responded with a status of 404 (NOT FOUND)http://odoo-10.pyproject.ninja/web/image/mass_mailing.s_default_image_logo Failed to load resource: the server responded with a status of 404 (NOT FOUND)http://odoo-10.pyproject.ninja/web/image/mass_mailing.s_default_image_block_three_cols_1 Failed to load resource: the server responded with a status of 404 (NOT FOUND)http://odoo-10.pyproject.ninja/web/image/mass_mailing.s_default_image_block_three_cols_3 Failed to load resource: the server responded with a status of 404 (NOT FOUND)http://odoo-10.pyproject.ninja/web/image/mass_mailing.s_default_image_block_three_cols_2 Failed to load resource: the server responded with a status of 404 (NOT FOUND)http://odoo-10.pyproject.ninja/web/image/mass_mailing.s_default_image_block_text_image Failed to load resource: the server responded with a status of 404 (NOT FOUND)