Good day @cristian_camilom,
Thank you for sharing your problem with the community.
After checking out your problem I figured out that the error you are experiencing is because the Ubidots library only supports the ESP8266 platform version v.2.7.4. Please, when installing this platform, make sure that you’re using the correct version.
You can find this at Tools > Boards Manager:
In addition to this, I’ve already reported with the development team that we need to upgrade the library so it supports the latest version of the ESP8266 Arduino platform.
Best regards,
Ángela