Steam Error On Updating

[GoldenPlaysTerraria]

When I try to update the game I get this message:
Steam - Error

An error occurred while updating Terraria (content file locked) :

C:\Users\Adults\Desktop\Steam\steamapps\common\Terraria\Terraria.exe

See the Steam support site for more information

Can anyone help me please I want to play Terraria ~

 

[Marcus101RR]

When I try to update the game I get this message:
Steam - Error

An error occurred while updating Terraria (content file locked) :

C:\Users\Adults\Desktop\Steam\steamapps\common\Terraria\Terraria.exe

See the Steam support site for more information

Can anyone help me please I want to play Terraria ~

Shutdown Steam and Terraria completely, it may still be running in the background. You must use Task Manager to end it.

 

[GoldenPlaysTerraria]

Shutdown Steam and Terraria completely, it may still be running in the background. You must use Task Manager to end it.

I used task manager to end it, it didn't work.