Message after set the "show query output" field: Unable to find the primary key

Message after set the "show query output" field: Unable to find the primary key

When editing a database query monitor and setting the "show query output" to yes, a message appears:

Unable to find the primay key for userlogin. Please use the "Primary Keys" option in that table to select a primary key and to access the query output

What's wrong with my query (select count(*) from userlogin where isLogged = 1) ? 





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