Can’t write files

I just installed a-shell and whenever i try an operation that requires write permissions such as `touch` or `mkdir` i get an `Operation not permitted` error. I seem to have the right permissions so i don’t know why this is happening.

```
[~]$ ls -la
total 8
drwxr-xr-x@ 7 mobile mobile 256 Mar 18 15:32 .
drwxr-xr-x 256 mobile mobile 8192 Dec 31 1969 ..
-rw-r--r-- 1 root mobile 583 Mar 18 15:31 .com.apple.mobile_container_manager.metadata.plist
drwxr-xr-x 2 mobile mobile 64 Mar 18 15:29 Documents
drwxr-xr-x 9 mobile mobile 288 Mar 18 17:05 Library
drwxr-xr-x 2 mobile mobile 96 Mar 18 15:32 StoreKit
drwxr-xr-x 2 mobile mobile 64 Dec 31 1969 SystemData
drwxr-xr-x 5 mobile mobile 160 Mar 19 11:27 tmp
[~]$ whoami
mobile
[~]$ touch test
touch: test: Operation not permitted
```
Any idea what’s going on and how to fix it?