Thank you ThomasV. I used the console to do as you described and it worked out fine for me. I reset my password.
I'd like to ask. Is this not a security threat. I mean, can't anybody reset my password like this?
I think that the point is that (due to the use of a character in the password that the program failed to properly recognize), the data was never encrypted in the first place. Unfortunately, even though the data wasn't encrypted, the "wallet.use_encryption" indicator was still set. Therefore the wallet "thought" that it needed to decrypt the data before it could use it. When it asked you for a password, it tried to use that password to decrypt data that wasn't encrypted in the first place.
By changing the value of "wallet.use_encryption", you didn't "reset your password", you just let the wallet know that it wasn't actually encrypted.