[Rails] The error occured while evaluating nil.gsub!

[Fird Abrar]

#{RAILS_ROOT}/app/controllers/start_controller.rb:13:in `create'
---

class StartController < ApplicationController

def create

#------------Remove Tag---------------------------

@name = params[:name]
@file = params[:filepath]

@file = @file.gsub!(/^.*(\\|\/)/, '')   # replace html tags with blank

post = Post.save(@params["removetag"])
end

end

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