[Resolved] Class Subject incorrectly extends base class Observable

[Resolved] Class Subject incorrectly extends base class Observable:

 

I was having the rxjs and typescript version in the package.json:

 

“rxjs”: “^5.4.0”,
“typescript”: “^2.4.2”,

 

Issue screenshot:

 

I modified the rxjs version to ^5.4.2 in package.json and ran npm install and it resolved my issue.

After Fixing the Screenshots:

 

Stackoverflow link