The reason you could be getting an error is because the fire stick does not support Android 8 , This is from Weyd
weyd only support Android OS
Given the recent announcement that a significant manufacturer of streaming devices is deploying a proprietary Operating System, we are clearly stating that weyd only supports Android 8+. There are also reports that this manufacturer will likely push existing devices to their Non-Android OS. If this happens, weyd will not be supported on those devices.
weyd will not be developed for any platform other than Android.
We strongly encourage weydians, who would wish to have continued access to weyd, to take advantage of the many Black Friday / Cyber Monday deals available, to migrate to a name brand Google Certified device.
As always, when researching a streaming device, it is strongly discouraged to “go cheap”. Many devices on various marketplaces contain malware from their manufacturers, distributers, and resellers. Only accept a Google Certified device from a reputable source.