How to fix the Runtime Error 21 Steam Error 21


This article features error number Code 21, commonly known as Steam Error 21 described as Error 21: Steam has encountered a problem and needs to close. We are sorry for the inconvenience.

Error Information

Error name: Steam Error 21
Error number: Error 21
Description: Error 21: Steam has encountered a problem and needs to close. We are sorry for the inconvenience.
Software: Steam
Developer: Valve Corporation

This repair tool can fix common computer errors like BSODs, system freezes and crashes. It can replace missing operating system files and DLLs, remove malware and fix the damage caused by it, as well as optimize your PC for maximum performance.

About Runtime Error 21

Runtime Error 21 happens when Steam fails or crashes whilst it’s running, hence its name. It doesn’t necessarily mean that the code was corrupt in some way, but just that it did not work during its run-time. This kind of error will appear as an annoying notification on your screen unless handled and corrected. Here are symptoms, causes and ways to troubleshoot the problem.

Definitions (Beta)

Here we list some definitions for the words contained in your error, in an attempt to help you understand your problem. This is a work in progress, so sometimes we might define the word incorrectly, so feel free to skip this section!

Runtime errors happen without warning. The error message can come up the screen anytime Steam is run. In fact, the error message or some other dialogue box can come up again and again if not addressed early on.

There may be instances of files deletion or new files appearing. Though this symptom is largely due to virus infection, it can be attributed as a symptom for runtime error, as virus infection is one of the causes for runtime error. User may also experience a sudden drop in internet connection speed, yet again, this is not always the case.

Fix Steam Error 21 (Error Error 21)

(For illustrative purposes only)

During software design, programmers code anticipating the occurrence of errors. However, there are no perfect designs, as errors can be expected even with the best program design. Glitches can happen during runtime if a certain error is not experienced and addressed during design and testing.

Runtime errors are generally caused by incompatible programs running at the same time. It may also occur because of memory problem, a bad graphics driver or virus infection. Whatever the case may be, the problem must be resolved immediately to avoid further problems. Here are ways to remedy the error.

Repair Methods

Runtime errors may be annoying and persistent, but it is not totally hopeless, repairs are available. Here are ways to do it.

If a repair method works for you, please click the upvote button to the left of the answer, this will let other users know which repair method is currently working the best.

How to Fix Steam Error Code 21?

steam error code 21

Steam is a great platform to download, buy, or play games. But many users have started encountering steam error code 21 when playing the game or buying them.

Usually, this is a runtime error that occurs while steam is running, the full error message is:

Error 21: Steam has encountered a problem and needs to close. We are sorry for the inconvenience

Every user wants to run steam games without any issue and if it causes any error then it really annoys the gamers. If you also want to get rid of this error code 21 on steam then continue reading this article.

Here you will get the effective fixes that will guide you in resolving the error on steam so that you can use steam without any more errors.

Also, get to know the reasons that are responsible for the occurrence of steam error 21. So, let’s get started…

What Causes Steam Error Code 21?

The error 21 on steam is really interrupting gamers and here are the reasons behind this error. Have a look at them:

Now, that you know the causes of error code 21 let’s move towards the solutions and get rid of steam error 21 to continue playing games.

How to Fix Steam Error Code 21?

Below are the solutions listed that will help you in resolving the steam error code 21, but before you move towards the fixes first, perform disk cleanup and see whether it solve the error code 21 or not.

Fix 1- Perform a Disk Cleanup

Disk cleanup utility helps in solving various issues in different situations. Try performing disk cleanup and fix the error code 21 on steam. Follow the steps to do so:

steam error code 21

steam error code 21

steam error code 21

steam error code 21

Now, let the disk cleanup do its work. After that, restart your system and launch steam to check if the error vanishes or not.

If after performing disk cleanup the error codes 21 on steam still persists then move onto the other solutions listed below.

Fix 2- Close the Apps that Conflicts with the Steam

If you encounter the steam error code 21 on your PC screen then it might be due to conflict between the running programs with the steam.

Close such programs and then launch the steam to check if the error code 21 disappeared or not. Follow the steps to close the programs:

steam error code 21

Open steam and see after closing which program the error disappears. Note down that app/program and permanently delete it.

Fix 3- Update Windows OS

In case your Windows version is outdated then there might be a chance that steam can show you the error code 21. You need to install the current version of Windows OS to fix this error.

Here are the steps to update your Windows:

steam error code 21

steam error code 21

This will search for the available updates and get it installed automatically. Once your Windows is updated, restart your PC and see if the error code 21 on steam got fixed or not.

Fix 4- Try Reinstalling Runtime Library

There are few runtime libraries such as MS Visual C++ package, if not properly installed then steam error code 21 can appear. Reinstalling the runtime library might help you in resolving this error.

Follow the steps to do so:

steam error code 21

steam error code 21

steam error code 21

After you have uninstalled the library, download its new version from Microsoft official website and install it.

Once the runtime libraries are reinstalled, open the steam and see if the error code 21 got vanished or not.

Fix 5- Update Graphics Card Drivers

Graphics card drivers are really important to play any game, if you see steam error code 21 while playing the game then there might be a possibility that your drivers are outdated.

Therefore, it is suggested that you update your graphics card driver and then run the game to check if the error got fixed or not.

Follow the steps to update drivers:

steam error code 21

steam error code 21

steam error code 21

This will search for the latest version of that particular driver and install it. After you have the newest version the error code 21 on stream won’t appear anymore.

If you don’t want to go with the manual steps then try Driver Easy to update the drivers automatically. This will not only update the drivers but also fix other kinds of driver issues without any trouble.

Get Driver Easy to Update the Drivers Easily

Fix 6- Reset IE Browser

If the steam error code 21 is caused due to internet explorer then it is advised to reset the browser to fix this error.

Follow the below steps to reset the error:

steam error code 21

steam error code 21

This will reset the IE, now you can launch the steam and check if the steam error 21 disappeared from the screen or not.

Fix 7- Try Disabling Script Debugging

After you have reset the IE browser, try disabling the script debugging to overcome the error code 21 on stream. Following the steps to do so:

steam error code 21

steam error code 21

After performing the above steps, it is expected that you are able to run the steam without the error code 21.

Several errors and issues are there that surrounds Windows PC and make their performance slow. There are manual solutions to fix such errors but it gets difficult for a novice person to perform them.

Therefore, here is an easy way to get rid of stubborn errors, try the PC Repair Tool. This tool is designed by professionals and it is easy to use for every individual.

You just have to download this tool and it will remove all the errors such as BSOD, game error, DLL, registry, update, application, repairs damaged files, prevent viruses from PC, and much more.

Get the PC Repair Tool to Make Your Windows PC Error-Free


All is said and done…here I am concluding my article.

I have listed down the solutions that will surely work in solving the steam error code 21 with ease and you can again launch the steam without any error.

Perform the fixes one after the other and continue playing the games. In case your steam is not detecting installed games then you can get the solutions as well to fix this issue.

Well, I hope that you liked this article and it turns out to be useful in solving the steam error. Apart from this, if you have any queries left then write to us on our Facebook page.

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