Horje
pubspec.yaml has no lower-bound SDK constraint. Code Example
pubspec.yaml has no lower-bound SDK constraint. 
You will get this error usually, when you clone project form github....

--> which must be because your pubspec.yaml file is missing lines as follow:-
              ---------------|
version: 1.0.0+1             |
                             |---> These lines......
environment:                 |
  sdk: ">=2.15.1 <3.0.0"     |
             ----------------|
  
--> So, check it out. 
--> if yes, then copy from your pubspec.yaml file of your own another project...
Well, it worked for me....hehehe



Whatever

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 Code Example
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Horje