Importer throwing BW Vault logon error about importer HOT 4 OPEN

From a quick look at the source code, I would guess that it's a problem with string escaping. The importer uses the CLI tool in the background and inserts the password directly in the commandline, which is a Problem when your password contains spaces.

See here:

This will also lead to problems with other special characters (aside from spaces) that need escaping in the commandline.

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I ran into this issue as well and changing my Bitwarden master password fixed it.
Apparently the Bitwarden importer tool doesn't seem to like spaces in passwords, and I'm not sure about other special characters.

Using v1.3.0 with macOS importer

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I have also had this same issue, when using spaces in passwords. After password is changed it works as expected. This was running the Windows 1.3.0 build.

from importer.

Same issue.

from importer.