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Bench build doesn't run for custom app


I downloaded Virtual disk, installed it and use for myself.
For my customization, I created new app mycustomapp.
I want to add new js library
I added

app_include_js = ["/assets/mycustomapp/js/mycustomapp.min.js"]

in the folder public I created build.json

 	"js/mycustomapp.min.js": [

then I run bench restart and bench migrate and bench clear-cache and finally bench build
but bench build doesn’t see mycustomapp assets.
in my site_config.json I set "developer_mode": 1
Please help me,
Thank you