API Error (Array to string conversion)

Hi,

I keep getting this error when I try to click Update on the Schema tab. First I try to create a table. Then added the following columns:

created_by - user_id_on_create
last_updated_by - user_id_on_update
created_on - timestamp_on_create
last_updated_on - timestamp_on_update

At this point I am still able to Update the table. Next I added a column id as binary with length of 36. Then I set this as the primary key and delete the example column that was created by default. When I hit Update now I get the error API Error Array to string conversion.

Not sure what to do at this point. Appreciate any assistance.

Thanks,
Allen