Hello to all.
Faced such a problem in iotawebwallet:
Reinstalled the browser, there was a complete reset of the entrance to the wallet (my wallet is not displayed). Tried to recover. I enter the Name, sid, password - in the answer: please input a valid 81-trytes seed. Although there can be no error in the side - just copied and pasted from a notebook.
Please help. On the coin purse.
First of all, I would not use web wallets at all. It is better to use
Trinity Wallet for IOTA.
Secondly, if you remove/reinstall your browser you used to access the web wallets, all saved states are usually removed as well, since they are stored in the browser cache or as cookies.
Have you used import function shown in
this image by entering a wallet name (arbitrarily), your seed and a password optionally? If so, please check if your seed is exact 81 characters long. If your seed is shorter than 81 characters (as it was allowed at the early stage of IOTA) then fill up the missing characters with 9s. For example, if you seed is 78 characters long, then go like that ABC....XYZ999.