<p>I had this problem with windows 10.  Installing the latest silverlight from here: <a href="https://www.microsoft.com/getsilverlight/Get-Started/Install/Default.aspx" rel="nofollow">https://www.microsoft.com/getsilverlight/Get-Started/Install/Default.aspx</a> did the trick</p>

CC BY-SA 3.0
2016-02-19T05:33:44.370Z
This also works for fixing Mac OSX
James A Mohler
CC BY-SA 3.0
2015-12-30T13:30:52.167Z
2015-12-30T13:30:52.167Z
LazyDave76
<p>I just had this same error happen now (but was having no problems a few months ago). So I searched for the latest version of Silverlight I could find and found version 5.1.50907.0 at download.cnet.com and installed and now EV3 is working.</p>
<p>Here's the link: <a href="https://download.cnet.com/microsoft-silverlight-64-bit/3000-2378_4-75884713.html?ex=WLS-1348.3" rel="nofollow noreferrer">https://download.cnet.com/microsoft-silverlight-64-bit/3000-2378_4-75884713.html?ex=WLS-1348.3</a></p>

CC BY-SA 4.0
2024-07-25T04:13:34.790Z
2024-07-25T04:14:56.437Z
2024-07-25T04:14:56.437Z
Jonagezz
<p>You will need Exit the application then remove the folder
C:\Users\LegoLeague\AppData\Local\LEGO\MINDSTORMS EV3
Then restart the EV3 Mindstorm application</p>

CC BY-SA 4.0
2022-02-05T16:10:22.190Z
2022-02-05T16:10:22.190Z
Waffle
<p>If the program opens but loading appears the whole time, just open a new program and save it... and open it again, it will work. </p>

<p>This is a glitch. </p>

CC BY-SA 3.0
2017-08-10T15:13:11.780Z
2017-08-10T19:41:37.423Z
2017-08-10T19:41:37.423Z
DEVA
<p>Try this guide I found in the LEGO Education Website:  <a href="https://education.lego.com/en-us/support/mindstorms-ev3/software-launch-issues" rel="nofollow">https://education.lego.com/en-us/support/mindstorms-ev3/software-launch-issues</a></p>

CC BY-SA 3.0
2015-01-06T11:47:57.090Z
2016-02-04T10:39:06.247Z
2016-02-04T10:39:06.247Z
Alberto Santos
<p>I Installed Mindstorms EV3 application on MS Windows 7 Home Premium v6.1 (Build 7601: Service Pack 1) and I keep getting the same error message when launching.</p>
<p>A white window pops up with the following:</p>
<p>LEGO MINDSTORMS EV3 has detected a problem during the application launch. Press OK to close the application and get more information about fixing the problem.</p>
<p>There is only a single &quot;OK&quot; button to press and it then launches the web browser to a Lego page link that cannot be found.</p>
<p>I have checked with Lego tech support and they suggested the issue was with MS Silverlight which I uninstalled and reinstalled along with the EV3 application... all to no avail.</p>
<p>Any ideas?</p>

CC BY-SA 3.0
2017-10-14T03:46:30.103Z
To my surprise, re-installing Silverlight did resolve the issue for me on .Windows 10)
user9322
<ev3><mindstorms>
Mindstorms EV3 PC application won't load
patter88
# Mindstorms EV3 PC application won't load

(Asked by: username_0 on 2015-01-06)

I Installed Mindstorms EV3 application on MS Windows 7 Home Premium v6.1 (Build 7601: Service Pack 1) and I keep getting the same error message when launching.

A white window pops up with the following:

LEGO MINDSTORMS EV3 has detected a problem during the application launch. Press OK to close the application and get more information about fixing the problem.

There is only a single "OK" button to press and it then launches the web browser to a Lego page link that cannot be found.

I have checked with Lego tech support and they suggested the issue was with MS Silverlight which I uninstalled and reinstalled along with the EV3 application... all to no avail.

Any ideas?

**Tags:** ev3, mindstorms

> **Comments:**
> **username_1**: To my surprise, re-installing Silverlight did resolve the issue for me on .Windows 10)  

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## 5 answers

### Answer by username_2 on 2015-12-30. Score: 3

I had this problem with windows 10. Installing the latest silverlight from here: <https://www.microsoft.com/getsilverlight/Get-Started/Install/Default.aspx> did the trick

> **Comments:**
> **username_3**: This also works for fixing Mac OSX  

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### Answer by username_4 on 2024-07-25. Score: 1

I just had this same error happen now (but was having no problems a few months ago). So I searched for the latest version of Silverlight I could find and found version 5.1.50907.0 at download.cnet.com and installed and now EV3 is working.

Here's the link: <https://download.cnet.com/microsoft-silverlight-64-bit/3000-2378_4-75884713.html?ex=WLS-1348.3>


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### Answer by username_5 on 2022-02-05. Score: 0

You will need Exit the application then remove the folder
C:\Users\LegoLeague\AppData\Local\LEGO\MINDSTORMS EV3
Then restart the EV3 Mindstorm application


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### Answer by username_6 on 2017-08-10. Score: 0

If the program opens but loading appears the whole time, just open a new program and save it... and open it again, it will work.

This is a glitch.


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### Answer by username_7 on 2015-01-06. Score: 0

Try this guide I found in the LEGO Education Website: <https://education.lego.com/en-us/support/mindstorms-ev3/software-launch-issues>


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