It shows that because it's not able to dig down the directories, because the permissions are wrong. The only way to get those errors is if the script can not create the files and directories errors. The script requires Read/write/execute access to those directories at the very least. Those errors show that it can NOT write to the files/directories.
If plesk is not setting it correctly, you'll need to speak to your hosting provider. If anyone else has plesk experience (we don't use it here), they may chime in with some advice as well.