Why FBT ERROR?

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when i use “./fbt fap_hello_world” command to build my application ,but it shows

********** FBT ERRORS **********
fap_hello_world: Do not know how to make File target `fap_hello_world’ (E:\jiuzhi\flipper_zero\code\github\flipperzero-firmware\fap_hello_world).

plz help!

From the few informations provided, I assume else the manifest file dies not contain hello_world as AppID or the source is not under applications_user

A great documentation is here: flipperzero-firmware/documentation/AppsOnSDCard.md at dev · flipperdevices/flipperzero-firmware · GitHub

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this picture is my source file under the application_user file, include .c .fam and .png
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and this is my .fam file content
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I felt like I was ready for building the code

Every app needs to be in an own folder, f.ex. in …/application_user/hello_world/, not direct in …/application_user/

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thanks a lot !