Error format variation - Invalid mount configuration / not a valid table name

[garyb]

{ "error": { "status": "Invalid mount configuration.", "detail": { "reasons": [ "not a valid table name: \"nghghf\"" ] } } }

To reproduce:

1. Add variables card
2. Add string-typed variable with default value
3. Add open card
4. Select the string-typed variable
5. Profit