# Symbol 'LE\_GPIOPIN21\_ACTIVE\_LOW' could not be resolved

**URL:** <https://forum.legato.io/t/symbol-le-gpiopin21-active-low-could-not-be-resolved/2383>\
**Category:** Legato Application Framework\
**Created:** [March 8, 2017, 10:13pm UTC](https://forum.legato.io/t/symbol-le-gpiopin21-active-low-could-not-be-resolved/2383 "2017-03-08T22:13:34Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![TheGod](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/thegod/32/252_2.png) [@TheGod](https://forum.legato.io/u/TheGod)\
**Post date:** [March 8, 2017, 10:13pm UTC](https://forum.legato.io/t/symbol-le-gpiopin21-active-low-could-not-be-resolved/2383/1 "2017-03-08T22:13:34Z")

</div>

I have just installed legato and opened Sierra Wireless sample project gpioCf3Demo.I cannot compile it. I have got error Symbol ‘LE\_GPIOPIN21\_ACTIVE\_LOW’ could not be resolved. Why?

---

<div class="post-metadata">

**Author:** ![daav](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/daav/32/64_2.png) [@daav](https://forum.legato.io/u/daav)\
**Post date:** [March 9, 2017, 7:56am UTC](https://forum.legato.io/t/symbol-le-gpiopin21-active-low-could-not-be-resolved/2383/2 "2017-03-09T07:56:58Z")

</div>

Hi @TheGod

Please can you be more precise?  
Are you using Developer Studio, or command-line tools to build your project?

---

<div class="post-metadata">

**Author:** ![TheGod](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/thegod/32/252_2.png) [@TheGod](https://forum.legato.io/u/TheGod)\
**Post date:** [March 9, 2017, 9:27am UTC](https://forum.legato.io/t/symbol-le-gpiopin21-active-low-could-not-be-resolved/2383/3 "2017-03-09T09:27:58Z")

</div>

Iam using Developer Studio

 ![](https://us1.discourse-cdn.com/flex019/uploads/legato1/original/1X/a1b5146ae054bc37aade577a55c7334c990efb8b.JPG)

---

<div class="post-metadata">

**Author:** ![daav](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/daav/32/64_2.png) [@daav](https://forum.legato.io/u/daav)\
**Post date:** [March 9, 2017, 9:36am UTC](https://forum.legato.io/t/symbol-le-gpiopin21-active-low-could-not-be-resolved/2383/4 "2017-03-09T09:36:19Z")

</div>

Please check my comment at [Error while accessing le\_data connection API in WP85xx legato application project - #10 by daav](http://forum.legato.io/t/error-while-accessing-le-data-connection-api-in-wp85xx-legato-application-project/2380/10) concerning **Semantic Errors**  
It seems that we do have a bad refresh behavior, but triggering the code analysis should fix this.

---

<div class="post-metadata">

**Author:** ![TheGod](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/thegod/32/252_2.png) [@TheGod](https://forum.legato.io/u/TheGod)\
**Post date:** [March 9, 2017, 10:11am UTC](https://forum.legato.io/t/symbol-le-gpiopin21-active-low-could-not-be-resolved/2383/5 "2017-03-09T10:11:22Z")

</div>

Thanks. You have resolved my problem.