Read the statement by Michael Teeuw here.
MMM-OpenWeatherForecast - loading issue
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 I am also having issues with the module being stuck on loading. In looking at the the debugging (ctrl+shift+i) when magic mirror is up I do get a 404 error for communicating to openweather. I have not changed any settings and do not have a line in my config file with the api base url. Other than that, I’m in the same boat as OP where I signed up to get the free API 3.0 and generated a new key… just can’t get anything working. 
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 @Como 3.0 apikey requires a credit card. today first 1000 api calls are not charged 
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 @Como 404 is not found, so the api url is incorrect 
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 @Como openweather changed their business model, only the 3.0 api is available. any 2.5 api requests will fail 
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 I realize that the api 3.0 is required. I mentioned I signed up for it as seen below.  
 I also generated a new key which is showing as active. So unless I’m generating keys that are no longer allowed per openweather (which I wouldn’t think is possible), then I’m not sure what the problem is.
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 @Como yes, as i said, i will debug this when i get nack to my desk on monday as for my reiteration of the v3.0 api, you said ‘free api’ , and there is no such thing anymore. just trying yo be precise 
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 Got it. Just wanted to make sure I was understanding too as I feel the oneweathermap site could be a little more clear on their keys. Thanks for all your hard work on this! 
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 Side note: If you are having problems with MMM-OpenWeatherForecast, make sure you are using Tom Hirschberger’s active fork. You can check this by running git remote -vin the module’s directory.
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 @KristjanESPERANTO @Como 
 rather than spend any time on thisrename your existing module out of the way and install 
 https://github.com/Tom-Hirschberger/MMM-OpenWeatherForecastno config changes I don’t think… (maybe lat/lon for location/locationID) 
 Tom is very active in supporting his work…
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 @Como did you get this resolved? 
 
 
 
