ubi filesystem error
 

I have used ubi filesystem and mtd subsystem to work on the top of NAND flash.
It was working fine.

But now I'm finding the following errors:

UBI error: ubi_io_read: error -74 while reading 516096 bytes from PEB 2701:8192, read 516096 bytes

end_request: I/O error, dev mtdblock5, sector 49160

what is the reason for those errors which I have mentioned above?
How to recover from these errors?

looks like a IO error. Nothing special

But do you have a recovery tool for ubifs yet?

http://www.linux-mtd.infradead.org/faq