Error: "Resizing file <path> failed: The requested operation cannot be performed on a file with a user-mapped section open."

Question

I keep getting this error pop up in a window in Unity, whether at start up, saving, or in general use:

Resizing file C:/Users/Public/Documents/Unity Projects/ProjectName/Temp/tempFile failed: The requested operation cannot be performed on a file with a user-mapped section open.

What do I do?

Epiphenomenalism

Try closing Unity and renaming that file?

– Margerymarget

renaming What file?

– Epiphenomenalism

Come on i need an answer.

– Epiphenomenalism

I also get this and am looking for an answer. My project is an SVN repo (windows with Tortoise), do you think perhaps tortoise could have the file open?

– Somewhat

Have you enabled external version system support?

– C

Answer 1

Try deleting that file as it seems to be in the `Temp` directory, whose files are generally 'expendable' ;)

If that does not work, try Assets -> Reimport Assets, or delete everything in the project folder except `Assets` and `Library`.

Fang

there's nothing there.

– Epiphenomenalism

Answer 2

I got this working by turning off my active anti virus software.

Circumferential

Answer 3

I DONT CARE IF THIS IS 14 YEARS OLD MAYBE IT WILL HELP SOMEONE

How to fix:

• Make sure unity is closed. Use task manager to close it.
• Install a file unlocker like this one
  IObit Unlocker, Solution for "undelete files or folders" Problems on Windows 8, 7, Vista, XP, 10 - IObit
• Locate the file shown in the error (mine was Assembly-CSharp.ref.dll)
• Right click the file and click open with unlocker
• Click “Unlock and Delete” in the drop down

Reloading the project should make unity recreate the file and unlock it from the system. This is a temporary fix so you might have to repeat this many more times in the future.

Izy

do i go into my normal files or the game files?

– Maomaoism