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Detailed step by step instructions to reproduce the problem
some days after me access my nas . it has not responded. and not work web-ui access i restart it . but nas had not start l see this error. I trying to solving some videos or google but no solution. please sir help me.
This in short means your system device/drive/hdd is failing to allow writes to the system pool (ROOT). And has done this before 674 times (wr = write).
This looks like a hardware failure on the system drive/device to me.
If you have not created any shares on your system disk, and only on your data pool, then your data should still be available to import after a new install.
Be very careful not to overwrite you data disks when re-installing using a new/replacement system disk.
You should disconnect all other devices except the new system disk for the re-install: to be safe. Then after shutting down the new install, re-connect all your old data disks and import them via: