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When the current user lacks the necessary permissions to access a file or directory. To resolve this issue, you can check the file or directory permissions, ensuring that the user has appropriate read, write, or execute permissions. Verify ownership, making sure the user is the owner or belongs to a group with sufficient permissions. If accessing system files, run the program or script with administrative privileges. Check if the file is currently in use by another process and close any applications that might have it locked. Ensure that the parent directory allows write access if you are creating or modifying a file within it. Antivirus or security software can also restrict access, so temporarily disable or configure it accordingly.