'Please fill in all required parameter values' error on Saved Cypher after Bloom update

Hi. After upgrading to the latest version of Bloom, I am getting this error on many Saved Cypher that used to work fine before the upgrade:
'Please fill in all required parameter values'

The search phrase is something this 'Search Groups for $kw'
And the query:

MATCH (n:Group) WHERE ToLower(n.title) CONTAINS ToLower($kw) RETURN n 

The error comes up when I search something like:
`Search Groups for java'

'java' should be the one keyword expected by the Saved Query but I get that error instead.

I can't see what else I could do differently.