Xiaomi India — Sd card not found

Website:

www.mi.com

When i reset my phone. Then my memory card is not use full. It means memorycard is shown but i can't use of their storage.in my files memory card is show but when i copy some files and paste in memory card so message is shown that ' can't copy'. So i request you to give me the solution of this problem. Please give replay very fastly. Aaand other error is camera error when i open camera it showes that' can't connect camera error'.