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System ui

Anything from a phone software problem to a broken card. As said above, we need more than "something isn't working".

The obvious thing to do is try the card in another device. If the card works there then that rules out one possible cause, while if it doesn't it strongly suggests that the problem is the card.
 
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Did you format it in the phone?
Does it work in any other device?
Has it stopped working or has it never worked?
Have you tried the obvious things: rebooting the phone, taking the card out and putting it back in again?

If it is new, has never worked, you formatted it in the phone (or the phone can't format it) and it still doesn't work, get a refund because the card is broken. Don't waste your time trying to fix it, it's the seller's responsibility if the card is broken when they send it to you.

If you bought it from an online marketplace (eBay seller, Amazon marketplace seller, Alibaba, or anything like that) then if you can get a replacement test the card before using it: a lot of the cards sold in those places are "fakes", small cards repackaged and reprogrammed to pretend they are larger cards, and if you get one of those and use it sooner or later you will lose your data (basically once the amount you store on it exceeds the real capacity of the card). The simplest test is using a utility called h2testw which you can download to a computer - I don't know of anything equivalent you can do with a phone.
 
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Ya I have try it many time puting in out in my smartphone vivo y11 but not working, system ui error and I try my sd card to other phone there no problem of sd card it work in other phone only in vivo y11 so how to solve system ui problem???

Which device did you format the card in?

A card must be formatted first before it can be used.

Depending upon the device and how the card was formatted, it may only work in the device that it was formatted in.

You might be better off just getting another card for this device, and using the card you have now in the device it works in.
 
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