I am no expert on Linux filesystem permissions but from the messages it seems to me that the folder write permissions are not set up correctly.
If you are running PartKeppr on Apache web server check if the www-data user group has the permissions to write to the PartKeepr folder.
For example if you list the content of your /var/www/html directory (command ls -l) your PartKeepr folder (/var/www/html/partkeepr) should have read/write/execute rights similar to the following:
drwxrwx--- 12 yourUserName www-data 4096 Feb 27 2020 partkeepr-1.4.0
( the "
" should write whatever was the user name of the user that created the
The same goes for all the other folders that are mentioned in the error description (app/cache, app/logs).