.sin extension error - opening unity script with VS community 2017

I just started using unity version 2018.1.1f1 and when i open a script within unity I get this error:

"The following files were specified on the command line:
C:Users\me\Documents\000_unity\Repos\NumberWizard\NumberWizard.sln
These files could not be found and will not be loaded"

I looked over many links but couldn't find a solution.
Any help is greatly appreciated.

 

I had trouble with this too, all I did to fix it is do Save Script As..
it should open up your file explorer and give the destination where your script is at(or you can change destination to where your script is at within unity Assets(where it normally is)) and then just press save.
Then it should be fixed, However you wont be able to you suggested words/phrases like "onCollisionEnter"
I don't know how to fix that. Hope This Helps