# atHelloWorld build project error **URL:** \ **Category:** Legato Application Framework\ **Created:** [August 28, 2025, 3:56am UTC](https://forum.legato.io/t/athelloworld-build-project-error/6945 "2025-08-28T03:56:24Z")\ **Posts on this page:** 1\ **Showing post:** 13
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [August 28, 2025, 9:20am UTC](https://forum.legato.io/t/athelloworld-build-project-error/6945/13 "2025-08-28T09:20:09Z")
you need to add some more parameter in mkapp command line: > [@FX30S - Build Error - Couldn't find file 'le\_avc.api'](https://forum.legato.io/t/fx30s-build-error-couldnt-find-file-le-avc-api/5878/6): > > Here is my example on helloworld sample: in hello1.adef, add bindings: { hello1.hello1Component.le\_avc → avcService.le\_avc } in Component.cdef, add requires: { api: { le\_avc.api } } leaf shell (lsh:swi-wp76\_4.7.0) owner@ubuntu:~/leaf/apps/Demo/hello1$ mkapp ${LEGATO\_DEF\_FILE} -s components -t ${LEGATO\_TARGET} -w ${LEGATO\_OBJECT\_DIR} -o ${LEGATO\_OUTPUT\_DIR} -i ${LEGATO\_ROOT}/interfaces/airVantage > **[Unknown error in "atServerIntegrationTest" due to specific API loading](https://mangoh.discourse.group/t/unknown-error-in-atserverintegrationtest-due-to-specific-api-loading/10129/4)** > > it should be: api: { atServices/le\_atServer.api le\_mcc.api le\_sim.api } bindings: { atServerTest.atServerTestComp.le\_atServer -\> atService.le\_atServer atServerTest.atServerTestComp.le\_mcc -\>... > **[AT cmds for Mirage Talon from MangoH Red board AT port](https://mangoh.discourse.group/t/at-cmds-for-mirage-talon-from-mangoh-red-board-at-port/4803/6)** > > //from terminal you can run the following //to initiate a wlon0 /sbin/ifup wlan0 //to scan /usr/sbin/iw dev wlan0 scan if you want it on you code use system() and/or popen() It works --- _[View the full topic](https://forum.legato.io/t/athelloworld-build-project-error/6945)._