ERP custom app Installation issue


In production(Using docker) setup using local .env
I got this error while building the image for custom app
Build command:
:\Users\Admin\Desktop\28.12.21\frappe_docker\build\ss_custom_erpnext-nginx>docker build --build-arg=FRAPPE_BRANCH=version-13 -t ss_custom_erpnext-nginx:v13 .

I hope anyone knows please guide me.