When you try to sign a transaction in Xumm, you receive the following message,
When you check the Xumm Session Log (Settings -> Advanced -> Session Log), you notice the following entry:
When you import an account into Xumm, you have the option to select either Standard or Extra security.
If you choose Extra security, you are presented with the option to create a unique signing password.
The "Unexpected error" is a general message that can be caused by various external factors such as:
- memory corruption
- storage corruption
- unsafe reboot while Xumm is still open
- driver issues
- corrupted 3rd party applications
The solution for this to is uninstall Xumm, then reinstall Xumm and re-import the account secret (secret numbers, family seed, mnemonic) for your account(s) back into Xumm.
We understand that you might have additional questions regarding this topic so you are welcome to contact us any time via the Xumm Support xApp in Xumm or you can simply scan this QR code with Xumm and be directed there automatically.