Symbol 'LE_GPIOPIN21_ACTIVE_LOW' could not be resolved

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?

Hi @TheGod

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

Iam using Developer Studio

Please check my comment at Error while accessing le_data connection API in WP85xx legato application project - #10 by daav concerning Semantic Errors
It seems that we do have a bad refresh behavior, but triggering the code analysis should fix this.

Thanks. You have resolved my problem.

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