What are the problems with readonly files?

Question

ubuntu

When opening a project in android studio, it writes "Clear readonly status" and shows some files from the project. I press OK, it says "Failed to change readonly status for the following files". Tell me how to be?
P.S. in the end, the project still opens when I press cancel, but it says "Can't save project", i.e. cannot be saved. :(

Answer 1

look at the permissions in the project for files:
read-only statuses:
-r--------
Owner has read permission; no one else can do anything
or
-rw-r--r--
All users have read permission; owner can edit
or
-r--r-----
Owner and group have read permission no one else can do anything
Here are the main values
​​\u200b\u200bRecursively change permissions in a directory:
or change owner:
sudo chown -R $USER папка_проекта