Your web part will not appear in the toolbox. Please make sure “gulp serve” is running in a web part project. Please refresh the page once “gulp serve” is running.

Error:

Your web part will not appear in the toolbox. Please make sure "gulp serve" is running in a web part project. Please refresh the page once "gulp serve" is running.

Este error suele aparecer la primera vez que intentamos probar nuestra solución SPFx. La mayoría de las veces ocurre porque no hemos instalado el certificado necesario y bastará con ejecutar el siguiente comando:

gulp trust-dev-cert

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