The Google Play Store app might shown an Error 18 when you're trying to download a new app, or when you're trying to update an app that's already installed on your device.
In order to fix the error your Samsung Galaxy S10 is having when Google Play Store is opened, then you should be checking the instructions in this post. This error is fixable and you should get rid of it easily. In case you're getting a different Play Store error, then you should tell us in comments and we should be able to help you.
In case your Galaxy S10 device shows the Google Play Store Error 18, then you should first try to reboot your phone and see if that fixes the issue. After you reboot the phone you should try to launch Google Play Store and see if the error is shown again.
Clear Play Store Cache and App Data:
Sometimes apps are getting bad and you can fix them by clearing the cache and app data. Here's how to clear the cache and app data: go to Settings> open the Apps list> find and open the Google Play Store app menu> now go to Storage and use the "clear cache" option to confirm the process. After the cache has been cleared you can use the "clear data" option, too.
If this action doesn't fix the Google Play Store Error 18, then you should get to the next tutorial below.
Free Up Some Space on your Galaxy S10 Internal / External Storage:
The Google Play Store Error 18 might also be shown due to insufficient storage space on your phone's internal or external storage. Go to your phone's Storage settings and look at the free space left on each storage, then start deleting some files that you don't need anymore. After you free up the storage space you can retry installing the app once again and see if the error continues to be shown by the Google Play Store app.
Remove and re-add your Google Account:
Another thing you can try would be to go to your phone's Accounts section and remove your Google Account, reboot the phone and then re-add your default account details and check the Google Play Store functionality. If this doesn't fix your phone, then the last thing you can do would be to factory reset the phone - check the info below.
Factory Reset the Samsung Galaxy S10:
If none of the above methods worked, then the last thing left to do would be to factory reset your phone. The factory reset process is going to remove all the installed apps and all the data from the system storage, so you will have to reconfigure your device from scratch, just like you did the day you bought it the first time.
The Factory Reset steps below can be applied using the Recovery Mode of your device:
- power off the phone.
- press and hold Volume Up + Bixby + Power buttons at the same time.
- release all the buttons when the Galaxy S10 screen turns blue.
- wait 30 seconds for the Recovery Mode options to load.
- select 'wipe data/ factory reset' and confirm process.
- reboot the phone in normal mode when you are done.
These were all the instructions you had to go over in order to try and fix the issues your Galaxy S10 has with running the Google Play Store app.
If you have any other problems running the Google Play Store app on your phone, then please feel free to let us know in comments. Also, if you can think of better solutions on how to fix the Google Play Store bugs listed in this post, then make sure to share them with others, too.