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“This Application Failed To Start Because No Qt…”

If you come across the error “This application failed to start because no Qt…”, Qt must be acting up and you should replace Qt files. Furthermore, you could perform a clean boot,  uninstall and reinstall the affected app, run SFC and DISM scans, remove recent Windows updates, etc. Spare some time to take a look at this article to tackle the error and put your application to good use. 

The Main Questions

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What is Qt?

For your information, Qt is a cross-platform software made for creating graphical interfaces as well as cross-platform applications in Windows, Linus, macOS, and Android.

How do I install Qt?

  • Step 1: Go to the Qt website and create an account
  • Step 2: Click Downloads in the left panel, select your preferred version and choose Downloads to get the Qt Installer.
  • Step 3: When the download concludes, press Windows + E to open Quick access, open Downloads and run the Qt Installer.
  • Step 4: Sign in using your Qt account then keep hitting Next. Proceed to choose between Help us to improve by enabling sending pseudonymous usage statistics in Qt Creator and Disable sending pseudonymous usage statistics in Qt Creator then hit Next. You then need to choose the folder where Qt will be installed and the version of Qt that you desire. Afterward, check the Associate common file types with Qt Creator and click Next
  • Step 5: Select the components you want to install and choose Next. Check I have read and agree to the terms contained in the license agreements then hit Next. In the case that everything is up to your liking, click Next and pick Install.

Which versions of Windows does Qt support?

Qt 6.4 supports Windows 10 (1809 or later) and Windows on ARM while Qt 6.2 supports Windows 11. Older versions of Windows are not supported by Qt.

Reasons Why Qt Won’t Work

Overall, Windows applications could run into various errors in use but regarding “This application failed to start because no Qt…”, you should consider the following suspects: 

  • Qt 
  • Third-party apps 
  • Corrupted system files
  • Windows updates

Dealing With Qt Issues: Guidelines

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Replace Qt Files

Note: For ease of convenience, we use Python for the solution. If you experience the error “This application failed to start because no Qt…” while using another app, go the folder of that app. 

  • Step 1: Press Windows + E to open File Explorer, hit This PC and search for pyqt5_tools using the search box on the top-right. 
  • Step 2: Right-click the pyqt5_tools folder then pick Open folder location. 
  • Step 3: Navigate to PyQt5 > Qt > plugins, right-click the platforms folder and pick Copy.
  • Step 4: Right-click the platforms folder and choose Copy
  • Step 5: Go back to the site-packages folder then navigate to pyqt5_tools > Qt > bin. Next, right-click on the empty space in the bin folder, pick Paste and hit Replace the files in the destination message. Last but not least, launch the app then determine whether the issue persists. 

Perform A Clean Boot

  • Step 1: Press Windows key, type msconfig and press Enter to open System Configuration.
  • Step 2: Go to Services tab, select Hide all Microsoft services and choose Disable all.
  • Step 3: Go to the Startup tab, hit Open Task Manager and disable everything in your sight.
  • Step 4: Close Task Manager, return to System Configuration and hit OK.
  • Step 5: Restart your computer. 

If your app launches as expected following clean boot, feel free to conclude that one of the third-party apps is the root of the trouble. To get rid of the error for good, you should uninstall recently installed apps. Finally, you could change back to normal startup by following the steps down below: 

  • Step 1: Press Windows key, type msconfig and press Enter to open System Configuration.
  • Step 2: Click Normal Startup on General tab of System Configuration then click OK.
  • Step 3: Restart your computer. 

Uninstall And Reinstall The Affected App 

  • Step 1: Press Windows + I to open Settings.
  • Step 2: Pick Apps, search for the affected app in Apps & features then click it. 
  • Step 3: Hit Uninstall, follow onscreen instructions and restart your computer. 
  • Step 4: When the screen comes back on, reinstall the app, launch it and see how things turn out. 

Run SFC And DISM Scans

  • Step 1: Press Windows key, type cmd and hit Run as administrator to open Command Prompt with administrative privileges. 
  • Step 2: In Command Prompt (Admin), type sfc /scannow and press Enter to run the SFC scan. 
  • Step 3: The moment the SFC scan completes, type the following commands in Command Prompt (Admin) and press Enter after you finish each to run the DISM scan:
    • DISM /Online /Cleanup-Image /ScanHealth
    • DISM /Online /Cleanup-Image /CheckHealth
    • DISM /Online /Cleanup-Image /RestoreHealth
  • Step 4: Type exit then press Enter to close Command Prompt.
  • Step 5: Restart your computer. 

Remove Recent Windows Updates

  • Step 1: Press Windows + I to open Settings, choose Update & Security and select View update history in Windows Update. 
  • Step 2: Hit Uninstall updates, right-click recent updates and pick Uninstall.
  • Step 3: Restart your computer as soon as the uninstallation wraps up. 

 

Surface Keyboard Pairing Button

Overall, if you have a hard time using the Surface Keyboard pairing button to pair the keyboard with your computer, reset is the best solution. Besides that, you could turn Airplane mode on and off, run Bluetooth troubleshooter, check out the batteries, update the keyboard driver, … Read to the end to learn what must be done to put Surface Keyboard to good use. 

Surface Keyboard Not Pairing: Fixes

Reset

  • Step 1: Press Windows + I to open Settings
  • Step 2: Choose Devices, locate Surface Keyboard in Bluetooth & other devices then select it.
  • Step 3: Hit Remove device.
  • Step 4: Press and hold the Surface Keyboard pairing button for about 7 seconds. Let go as soon as the light above Up arrow key blinks. Next, go back to Bluetooth & other devices, click Add Bluetooth & other devices then pick Surface Keyboard. Proceed to enter the code once prompted, hit Enter and follow onscreen instructions. 
  • Step 5: See how things turn out. 

Turn Airplane Mode On And Off 

  • Step 1: Press Windows + I to open Settings, select Network & Internet then choose Airplane mode.
  • Step 2: Toggle the switch on and wait for a minute. 
  • Step 3: Toggle the switch off, use the Surface Keyboard pairing button to pair the keyboard with your computer and witness the result. 

Run The Bluetooth Troubleshooter

  • Step 1: Press Windows + I to open Settings.
  • Step 2: Click Update & Security then pick Troubleshoot.
  • Step 3: Choose Additional troubleshooters, select Bluetooth and hit Run the troubleshooter
  • Step 4: If the troubleshooter manages to identify the root of the trouble, click Apply this fix.
  • Step 5: Restart your computer. 

Update The Keyboard Driver

  • Step 1: Go to Search bar, type devmgmt.msc and press Enter to open Device Manager. 
  • Step 2: Expand Keyboards, right-click Surface Keyboard and pick Update driver. 
  • Step 3: Follow onscreen instructions.
  • Step 4: Restart your computer after the process finishes.
  • Step 5: When the screen comes back on, pair the keyboard with your computer one more time. 

Check Out The Batteries 

As a wireless model, Surface Keyboard draws power from batteries so if its batteries deplete, it won’t work. To determine whether batteries of the keyboard must be replaced, all you have to do is press Caps Lock, Numlock and other keys. If the indicators above the keys light up, there is no need to replace batteries. On the other hand, if the indicators don’t respond, pick up replacement batteries. 

Q&A

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Why does the light above Up arrow key of Surface Keyboard flash three times and turn off? 

That means Surface Keyboard is currently connected to another device in the vicinity. Disconnect Surface Keyboard from that device to be able to pair it with your computer.

How come what I type on the keyboard doesn’t match what I see on the screen? 

  • Step 1: Press Windows + I to open Settings, select Time & Language and choose Language. 
  • Step 2: Take a look at Keyboard language (the input language) and PC language (the display language) then apply changes if necessary. 
  • Step 3: Type something. 

Is it possible to customize the change language shortcut? 

  • Step 1: Press Windows + I to open Settings, select Devices and choose Typing. 
  • Step 2: Click Advanced keyboard settings then pick Input language hotkeys.
  • Step 3: Configure the settings as you see fit, choose Apply and select OK. 

Why does the Surface Keyboard keep blinking red?

Surface Keyboard is going to blink red if its batteries approach depletion. To avoid interruption, replace your batteries at the earliest opportunity. 

What must be done to add an input language?

  • Step 1: Press Windows + I to open Settings, select Time & Language and choose Language. 
  • Step 2: Locate the language you want to add under Preferred languages, click it and pick Options 
  • Step 3: Choose Add a keyboard, select your preferred keyboard and follow onscreen instructions. 

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