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Why Does My Qt Application Fail to Start with the 'Application Failed to Start Because Platform Plugin 'Windows' Is Missing' Error?

Linda Hamilton
Release: 2024-11-07 21:37:03
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Why Does My Qt Application Fail to Start with the

Qt Platform Plugin "Windows" Missing: Troubleshooting the "Application Failed to Start" Error

This common error encountered when starting a Qt application stems from the absence of the "windows" platform plugin. Despite searching for similar issues, none of the previous solutions have provided a satisfactory resolution.

After extensive troubleshooting, the root cause was identified as the missing libEGL.dll. Unlike other missing DLLs, such as Qt5Gui.dll, this specific file is not explicitly reported upon application startup.

Solution:

To resolve this issue, ensure that the libEGL.dll file is present in the application's directory or in the appropriate system folder (e.g., Windows/System32).

Additional Tips:

  • Verify that the application's "platforms" folder contains the correct files, including qwindows.dll.
  • Rename the "platforms" folder to "platform" does not resolve the issue.
  • Reinstalling Qt or Visual Studio may also help troubleshoot the problem.

By addressing the missing libEGL.dll issue, you can successfully launch your Qt application without encountering the "Application failed to start because platform plugin 'windows' is missing" error.

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