Reimported animation Error message

I did some touch up on an animation and then tried to reimport it into Unreal. It shows up in the animation editor and plays back fine but when I try to save the updated file, I get this error message:

The asset ‘/Game/Animation/Zombie/ANIM_GENERALZOMBIE_CRAWLCYCLE_1’ (ANIM_GENERALZOMBIE_CRAWLCYCLE_1.uasset) failed to save.

Cancel: Stop saving all assets and return to the editor.
Retry: Attempt to save the asset again.
Continue: Skip saving this asset only.

All of the other animations that I have recently updated saved properly. Has anyone seen this error message before?

Thanks

I think that I found the problem. The file was locked, it seems to be exporting and saving now.