If particular app or apps fail to load, consider restarting your mobile device.
The don't know how to restart my device guide offers useful tips on how to restart any mobile device.
Maybe the app is frozen. Quitting the app and opening it again should unfreeze it and let you run it again.
The don't know how to close (quit) programs/applications guide offers tips on how to close apps.
Maybe the latest version of the app has bugs or is not compatible with the operating system version of your device. Try downloading an older version on the app and installing it on your device. Since the official stores (Google Play, App Store and Windows Store) offer the latest versions only, you need to download the older version manually, from third-party websites.
Before you install the older version, remove the latest version (check out the don't know how to uninstall a program / an application guide if you are not sure how).
This article on Beebom contains instructions on where to find and download older versions of apps. However, bear in mind that some apps on those websites might have been modified to steal your data.
Reinstalling the app will replace the corrupted files which might be the ones which prevented the app from opening. First of all uninstall the app (see the don't know how to uninstall a program / an application guide if you are not sure how) and then download it and install it.
Maybe a bug in the software itself prevents you from running the app. Contact the app developer(s) and notify them about this issue.
You can notify the developer(s) either on their website(s) or in the respective store (Android: Google Play; iOS: App Store; Windows Phone OS: Windows Store).
It is very important to update the device's operating system on time as the updates contain fixes to various bugs and resolve compatibility issues. If you don't receive a notification about the update, which you should, once an update is available, check manually if one is available.
See the don't know how to update my operating system guide if you are not sure how to check for updates manually.
Maybe a bug in the app prevents you from loading it. Updating the app should resolve the issue as updates contain bug-fixes and performance improvement of the app.
If you are not sure how to update apps, check out the don't know how to update programs/applications guide.
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