There are three wallets in my NCC, recently i can’t open one of them in Chrom, FireFox and IE.
can open other wallets and create new wallet successfully.
see the following screenshot.
is there a chance you had some space or dot inside wallet name? (error 500, means it’s fatal ncc error, and not usual error)
hi grimer, thanks for your reply.
there are not any space or dot inside my wallet name. i have used this wallet several times two weeks ago.
when this issue came to me, i tried to open other wallets, it seems that there are no problem on other wallets.
is it possible that it causes by the lightwallet? i used lightwallet few days ago.but i didn’t import any wallet into lightwallet.
i can send you my passwords and the files which named as *.adb and *.wlt if necessary.
no, i am waiting for your response 
is it possible that the one that you can’t open is some older wallet?
I have similar problem. I have wallet files from my computer and I know my password but I haven’t privatekey or wallet address.
If you have the wallet and the password, then you should be able to open the wallet.