Please make sure you are connected to the internet and if there is an internet policy please make sure that it allows you to use the website/application.
Make sure you have the latest app version.
OLX application is only available for Android and iOS if both are not available you can use the website version on your mobile internet browser.
This might be due to a browser problem, OLX is better viewed on Mozilla Firefox or Google Chrome.
If you are still facing the same problem please contact us.