Tex Studio is not working all of a sudden. Saying *sty files not found

I have been using TexStudio this week. Just yesterday, I decided to shutdown my computer. Today I restarted it and opened TexStudio. But, all of a sudden it is not compiling anymore. It comes with error saying that some *sty file is not found. For example setspace.sty not found as given in the. I then remove it, but it then says titling.sty not found. However, the document seems to compile well with Texworks. So I am really confused what the problem is?

Can someone help?