How to fix Error 393 on Windows 11

by

Why This Error Happens

Error 393 (“The cloud operation was aborted”) is generated by the Windows Cloud Files API (CldApi.dll), which manages placeholder files for cloud sync clients like OneDrive. This error typically occurs when the sync engine’s connection to the cloud provider is interrupted mid-transfer — often due to a corrupted local sync database, a network timeout, or a security application (antivirus/firewall) blocking the CloudFilter driver’s file handle. It can also appear if the placeholder file’s metadata becomes desynchronized from the actual cloud file, causing Windows to cancel the read/write operation for data integrity reasons.

Step-by-Step Resolution Guide

  1. Restart the Cloud Sync Client Cleanly
  • Press Ctrl+Shift+Esc to open Task Manager, locate the sync client process (e.g., OneDrive.exe), and select End Task.
  • Relaunch it via Win+R, type %localappdata%\Microsoft\OneDrive\OneDrive.exe, and press Enter.
  1. Reset the Sync Engine
  • Press Win+R, type %localappdata%\Microsoft\OneDrive\onedrive.exe /reset, and press Enter.
  • Wait 1–2 minutes for the icon to disappear from the system tray, then relaunch OneDrive manually from the Start Menu if it doesn’t restart automatically.
  1. Check and Repair Local File Permissions
  • Navigate to your cloud sync folder (e.g., C:\Users\<YourName>\OneDrive).
  • Right-click the folder → Properties → Security tab → ensure your user account has Full Control.
  • If permissions look corrupted, click Advanced → Disable Inheritance → Convert to explicit permissions, then re-add Full Control for your account.
  1. Temporarily Disable Third-Party Antivirus/Firewall
  • Open Windows Security → Virus & threat protection → Manage settings → toggle off Real-time protection temporarily.
  • Retry the file operation that triggered Error 393. If it succeeds, add an exclusion for the sync client’s install folder in your antivirus settings instead of leaving protection off.
  1. Clear the Cloud Cache and Re-sync
  • Sign out of the OneDrive/cloud client via its tray icon → Settings → Account → Unlink this PC.
  • Delete leftover cache files at %localappdata%\Microsoft\OneDrive\settings.
  • Sign back in and allow the client to re-download the sync database and placeholders.

Alternative or Verification Steps

  • Verify the fix: Right-click the previously failed file/folder and select Always keep on this device; if it downloads fully without an error popup, the issue is resolved.
  • Alternative fix: If the error persists, run sfc /scannow in an elevated Command Prompt to repair corrupted system files that may affect the CloudFilter driver, then reboot and retry the sync.