looks like you got some file system corruption, have your computer rebooted recently? you might have to redownload blockchain by the looks of things
Not that I remember
Anyway that I can transfer and copy safely the blockchain and other data from one other updated computer?
as long as versions are the same
That sounds good – do you know exactly which file should do the trick?
make backup of old data directory, then just copy the whole roaming data folder of nu from working machine, and replace wallet*.dat with the ones that you’ve backed up. that should work
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Make a disk scanning, perhaps it has bad sectors! Is it SSD or HDD?
Use HDtune and perform an error scan (not a quick one).
It is a slow procedure but if you see red sectors then you need to replace the HDD 
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It failed to load the blkindex.dat
both machines run 2.0.3 on windows? and loading working blkindex.dat does not work???
Absolutely –
Did you shut down the Nu wallet on the machine from which you copied, before you started copying thd application data folder?
Yes
transferred everything except nu.data and the keys
And on the machine from where you copied the files the Nu wallet can still be started without errors?
If yes, it looks like there’s something wrong on hardware/filesystem level on the machine that fails to load the wallet.
absolutely
I dont know that works – my other PPC and BKS signing clients keep on running fine
Going to try to re-DL the blockchain from zero –
Would be great to have a bootstrap survival kit or something for users to safely reboot their client
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Under Popular Links in Help us test Nubits v2.1.0 there’s a bootstrap.dat you may have use for.
I’d first try only removing blkindex.dat and have the client reindex.
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The bootstrap file you linked is for 2.1 (leveldb) and @crypto_coiner runs 2.0.3 (libdb) - unfortunately that won’t work, unless the Nu wallet gets upgraded.
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always include a copy of error message.
Copy blk* and database/* nu.conf . Permission must be set to 600. You don’t have to copy addr.dat.
Don’t copy debu.log and db.log. If you start with no wallet, new empty wallets will be generated and things usually go faster and more smoothly. Once everything is sync’ed, copy your wallet with coins to the directory. The data bases and wallet will be sync’ed again quickly.
I thought about the access right permission – not sure if I did the right thing