Error map
Time Machine couldn't complete the backup macOS: Time Machine couldn't complete the backup. / The backup disk image could not be mounted / Backup failed with error 18/19/21/22
macOS · layer 6, Platform & cloud
Centre: this error. First ring: errors it is linked with (7). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (7)
macOS: diskutil: Unmount of disk2s1 failed: at least one volume could not be unmounted / The disk wasn't ejected because one or more programs may be using it
macOS can't eject a drive because a process still has files open on it.
Homebrew: Error: No available formula with the name "x". Did you mean ...?
Homebrew can't find a formula or cask with that name in the taps it knows.
Homebrew: Error: Your Command Line Tools (CLT) are too outdated. Update them from Software Update / Please update to the latest macOS
Homebrew requires a newer Command Line Tools version than the one installed.
Homebrew: Error: It seems there is already an App at '/Applications/Chrome.app'
A cask install failed because the app is already installed manually (or a leftover exists).
macOS (Apple Silicon): zsh: bad CPU type in executable: ./tool
You ran an Intel (x86_64) program on an Apple Silicon Mac without Rosetta 2 (or an arm64 binary on an Intel Mac).
macOS: The Finder can't complete the operation because some data in "x" can't be read or written. (Error code -36)
Finder hit a read/write problem while copying — usually metadata files (`._*`, `.DS_Store`) on non-Mac file systems or a failing…
macOS: There is not enough available storage to install this update / Installation of macOS could not continue
Software Update needs several GB of free space (often 25-35 GB) to download and stage the update.
Two steps away (18)
macOS: hdiutil: create failed - Resource busy (or: hdiutil: couldn't eject "disk2" - Resource busy)
A disk image operation failed because the volume or a file in it is still in use (Finder, Spotlight, a terminal).
macOS: The operation can't be completed because one or more required items can't be found. (Error code -43)
Finder tried to act on an item that is gone, renamed, or an alias/symlink pointing nowhere.
macOS: The operation can't be completed because the item is locked / rm: Operation not permitted (uchg flag)
A file has the immutable (`uchg`) flag or is in use, so Finder/`rm` refuse to delete or change it.
macOS: zsh: command not found: brew (Homebrew not on PATH on Apple Silicon)
Homebrew is installed in /opt/homebrew on Apple Silicon Macs, which isn’t on PATH until you add its shellenv line.
Homebrew: Error: Permission denied @ dir_s_mkdir - /usr/local/Cellar / /opt/homebrew is not writable
Homebrew can't write to its prefix because the folders are owned by another user or root.
Homebrew: Error: Failure while executing; `git fetch --force origin` exited with 128 / fatal: not in a git directory
`brew update` couldn't fetch the Homebrew repositories — network, a broken git state or safe.directory problems.
gyp: No Xcode or CLT version detected!
node-gyp on macOS can’t find the Xcode Command Line Tools to compile native modules.
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun
The Xcode Command Line Tools are missing or broken — typical right after a macOS update.
macOS: Agreeing to the Xcode/iOS license requires admin privileges, please run "sudo xcodebuild -license" and then retry this command
A new Xcode (or CLT) version needs its license accepted before command-line tools run.
macOS: xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance
A command needs the full Xcode app, but `xcode-select` points to the Command Line Tools only.
macOS: “app” cannot be opened because Apple cannot check it for malicious software / Apple could not verify “app” is free of malware that may harm your Mac
Gatekeeper blocked an app that is not notarized by Apple.
macOS: “app” can’t be opened because it is from an unidentified developer
Gatekeeper refuses to open an app that isn't signed with a registered Developer ID.
exec /usr/local/bin/docker-entrypoint.sh: exec format error
The container tried to run a binary built for a different CPU architecture (arm64 vs amd64) — or a script with a broken shebang /…
zsh: compinit: insecure directories, run compaudit for list. Ignore insecure directories and continue [y] or abort compinit [n]?
zsh refuses to load completions from directories owned by another user or writable by others.
zsh: no matches found: package[extra] (glob pattern not matched)
zsh treats `[ ]`, `*` or `?` in an argument as a glob and fails when nothing matches, unlike bash which passes the text through.
macOS: mkdir: /data: Read-only file system / touch: /usr/bin/x: Read-only file system
Since Catalina the system volume is read-only and sealed; you can't create directories at `/` or modify system folders.
no space left on device (Docker / Linux)
The disk (or inode table) is full — Docker images, build cache, logs and volumes are common culprits.
macOS: The installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.
A `.pkg` installation script failed; the Installer UI hides the real reason.
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