I am learning flutter, and improving myself by doing different projects. But now, I've got one problem for hours. Why I can not pub get my pubspec.yaml file? I have Internet connection.But I can't get any package and can not pub get it.
I tried it in other projects without installing any package, but it was a fail too. How can I fix this problem? May be I have another serious mistakes. Please give me your advises and thank you in advance.