ADE Happened with me too...
I waited for some days not u comes fine.
1. You should once check your Network.
2. Clear the cache of your phone (I think so)
3. Your device might have many unnecessary applications try remove the vague ones.
4. Possibility of server error at the time when you were trying to load the code.
After this it became fine.
I think uninstalling and re-installing can also be an alternative to solve the problem...
If issue still persists email to sololearn ,😅
TRY ALL THESE
* Restart your device
* Clear cache memory
* Probably your device may be overloaded by many apps, try deleting them
* If still it doesn't work, then there may be some mistake in that programming itself so it's not showing any output.
* Uninstall the SoloLearn and then install it again