The spelling is incorrect.
You are trying to retrieve records from costumer table which does not exist.
should be customers
now it does not even run the workbench crashes
I am having the same issue. I downloaded the sql zip that mosh provides but when i open the table, my workbench crashes. I have an older Mac so i had to download an archived version of the workbench. i am able to load the files but it shows errors when i run it with the electric bolt symbol. I think this is why it is crashing.