chore: generic error message

[alfredotoselli]

Description

Currently when the embedder is changed the memories are eventually dumped and then recreated.
The error described by the previous message should not occur, so a more generic one might be better

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[pieroit]

Thanks @alfredotoselli