Dba.createCluster: ERROR: 1 table(s) do not have a Primary Key

[Sivan Koren]

When I try to use dba.createCluster in mysqlsh I get the error:

"Creating InnoDB cluster 'idbCluster' on '[e-mail]:3306'...
Dba.createCluster: ERROR: 1 table(s) do not have a Primary Key
ERROR: Error starting cluster: The operation could not continue due to the following requirements not being met:
Non-compatible tables found in database. (RuntimeError)"

However, I'm not seeing any tables that don't have a primary key. Checking the information_schema shows that all tables in the database (except views) do in fact have primary keys as described by:

"select t.table_schema, t.table_name, engine
from information_schema.tables t
inner join information_schema.columns c on t.table_schema=c.table_schema and t.table_name=c.table_name
where t.table_schema = 'mydb'
group by t.table_schema, t.table_name
having sum(if(column_key in ('PRI','UNI'), 1,0)) = 0;"

I don't see anything relevant in the mysqld log either. Is there a log for mysqlsh?

Anyone have any idea why I might be getting this error or how to get more details about which table might be causing this?