Ruby on Rails

I had created a demo web application by executing rails tickets and then
i executed rails script/server to run it on localhost.

Initially i was able to execute the application in the browser by typing
localhost:3000 in the address bar, but then I deleted the folder tickets
from my hard disk.

Now again i created the same folder but when i try to run it using the
same command rails script/server it says that

File exists - script/server

I tried deleting the script/server file but i still couldn't run the
localhost:3000 in the browser

What is the solution to this

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