How to use for select option to post to the database

Hi am new to Wappler, I have created a simple form with two text fields and when I run the form on the browser all seem to work well and the data is posted to MySQL database. When I introduce a simple select option, the submit button does not work

I just dont know where I am doing wrong

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API Querry
INSERT INTO cred
(email, city_name) VALUES (:P1 /* {{$_POST.email}} /, :P2 / {{$_POST.selectcity}} */)

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