How do I fix an error occurred such as 1852797029

Try this -> Restart your iPhone – Apple Support (UK) or -> Force restart iPhone – Apple Support (UK)

Disconnect / remove the headphone, if it is connected.

If you get that error while watching Netflix, see -> Netflix Help Center.

When did the error occur?

It would be better if you can please re-post with a screenshot, in order to understand the phenomenon better. Images/pictures speak louder than words. 

Please understand this is a public forum: While attaching a Screenshot, do not provide any personal credentials, such as IP address, Card detail, email id, apple id, IMEI number, Serial Number, Phone number, Order ID, if you are sharing a map ensure your location is not identifiable, etc.

With the limited information that you have provided, It is hard to even guess the problems faced by you. 

You may get faster and better responses to your query by --> Writing an effective Apple Support Commun… - Apple ...

Please re-post with detail so that someone else can help.