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Failed to start game (application already running)

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When you try to launch a Steam game on your Windows 10 or Windows 11 computer, you may receive the error message Failed to start game (application already running). In this article, we will identify the potential cause and provide the most appropriate solutions to the error.

You are more likely to encounter this error when launching a game that closed improperly with a silent crash, or that does not launch correctly. In some cases, the game may already be running under a different user account on your Windows gaming PC.

How do I fix the Steam runtime error?

Just open the game property sheet, click the button Local files tab> Check integrity of game files. Depending on the size of the game, this process may take a while. Wait for the process to complete, then restart the Steam client and open the game. The problem should be resolved. See detailed solutions below.

Failed to start game (application already running) – Steam error

If you are faced with this Failed to start game (application already running) – Steam error, you can try our recommended solutions below in no particular order and see if that helps resolve the issue.

  1. Exit the game process
  2. Log out of other user accounts on PC
  3. Restart the computer
  4. Unsubscribe from the current beta of Steam (if applicable)
  5. Check the integrity of the game file

Let’s take a look at the description of the process involved regarding each of the solutions listed.

1]Exit the game process

This solution requires you to terminate / kill the game process through Task Manager, command line, or third-party tools. If that did not resolve the Failed to start game (application already running) error, you can move on to the next solution.

2]Log out of other user accounts on PC

As already stated, if the game is already running under a different user account on your Windows gaming PC, you will experience this issue. In this case, to resolve the issue, you must log out of other user accounts on your computer.

3]Restart the computer

Simply restarting your Windows 10/11 PC can easily fix this problem. Otherwise, try the next solution.

4]Unsubscribing from the current beta version of Steam (if applicable)

If you are currently participating in the beta version of Steam, you may experience this issue. In this case, you can try to unsubscribe and retest the problem.

Proceed as follows:

  • In Steam, click on Steam at the top left, then choose the Settings menu.
  • Click it Account tongue.
  • Click it Switch button under Beta participation.
  • From the drop-down list, select the NONE – Unsubscribe from all beta programs option.
  • Click on Okay.
  • Click it Restart Steam button on the prompt that appears.

The issue in question should be resolved, otherwise try the next solution.

5]Check the integrity of the game file

If there is any problem with installing the game, you will get this error. In this case, you can use Steam’s built-in utility to check the integrity of game files. Here’s how:

  • Open the Steam client.
  • Click it Library tab to see your games.
  • Now right click on the problematic game and select Properties.
  • In the pop-up window, navigate to the Local files tongue.
  • Click it Check integrity of game files button.

Depending on the size of the game, this process may take some time; so be patient and wait for Steam to validate the game files – Steam will automatically re-acquire files that failed the validation check.

Hope this helps you!

Why does Steam say my game is running when it isn’t?

PC gamers usually encounter this problem when your previous game didn’t stop properly or when you simply forgot to quit. For each game installed and downloaded through Steam, the Steam client must be open to work.

Similar article: An error occurred while installing or updating the Steam game


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