I can't save html file

[natamike-it]

I'm having a problem with Phoenix Code. I can't save the HTML file after editing it.
Every time I try, I get a pop-up message saying "Error saving file. An error occurred when trying to save the file..." (error unknown).
Can you help me?
Thanks

[devvaannsh]

@natamike-it , Can you try saving the file using a different code editor? This will help us determine whether the issue is with Phoenix Code or with your OS/file system.

If possible, please press F12 to open the developer tools, and check the console window for any errors when you try to save the file so that we can pinpoint the actual issue.

[natamike-it]

Thanks for the quick response. I actually think it's a file system issue because I tried Visual Studio Code and had the same problem. In this case, the error message is more detailed, and I've attached a screenshot.

I recently installed the new Tahoe 26.0 operating system and am using an M3 IMac.

I'd be grateful if you could help me resolve this.

Thanks

[natamike-it]

This is F12 screenshot.

[abose]

Chat GPT says:

The NoModificationAllowedError on macOS usually shows up after a macOS update when the filesystem path you’re trying to write to is either:

Read-only (common since macOS Catalina and newer, where the system volume is mounted read-only by default), or

Sandbox-restricted (apps without the right permissions can’t modify files in certain directories, e.g. Desktop/Documents/Downloads unless explicitly granted access), or

ACL / permission changed during the upgrade (ownership reset, SIP enforced, quarantine flags, etc.).

Here’s what you can try:

1. Check where you’re saving

If you’re writing into /System, /bin, /sbin, or /usr (except /usr/local), these are read-only now. You’ll get NoModificationAllowedError no matter what.
→ Save to /Users/yourname/... or /usr/local/....

2. Verify file & folder permissions

Right-click the file/folder → Get Info → at the bottom, check “Sharing & Permissions.”

Make sure your user has Read & Write.

If it’s wrong, click the lock, authenticate, and fix it.

Also try in Terminal: ls -le path/to/file Look for ACLs or root ownership issues.

3. Check sandboxing restrictions

If this happens in a browser (Safari/Chrome) or a sandboxed app, saving files directly outside allowed folders may fail.
→ Try saving inside Documents, Downloads, or another user-writable folder.

4. Full Disk Access

Some apps (editors, terminals, IDEs) may need Full Disk Access after macOS updates.

Go to System Settings → Privacy & Security → Full Disk Access

Add your app there, restart it, and try again.

5. Reset permissions if broken after update

Sometimes macOS updates reset home folder permissions:

diskutil resetUserPermissions / id -u

(replace / with the correct volume if not the system one).

6. Quarantine / Extended attributes

If the file was copied from another machine:

xattr -l path/to/file xattr -d com.apple.quarantine path/to/file

[natamike-it]

Problem solved thanks to your valuable suggestions.

Thank you so much