how to configure the official php app template?

[Webstollen]

Hi, Im new to shopify and trying to delelop an shopify app with the php template https://github.com/Shopify/shopify-app-template-php. but the operations in readme didnt help me get things running.

I just put my

CLIENT_ID

and

CLIENT_SECRET

in web/.env. i keep getting 500 Server Error.

i believe the database settings and migration to be ok. 

Am i missing other things? i have no idea what can i do to make it right.

i use windows, yarn, chrome(also tried firefox, edge, none of them worked)

I would really appreciate any advice, thanks in advance.