TypeError (can't cast Enumerator to string): - Ruby on Rails

Hi,

When I am trying to upload a file through the url - http://0.0.0.0:3000/upload/get . I am getting an error as

Started POST "/upload/save" for 127.0.0.1 at 2014-05-27 01:29:29 +0530 Processing by UploadController#save as HTML   Parameters: {"utf8"=>"✓", "authenticity_token"=>"khU59z0DsXoVyHeu4XNaUb7TEpSWZ9id4dJTbVu6efU=", "picture"=>{"comment"=>"dfgjk", "uploaded_picture"=>#<ActionDispatch::Http::UploadedFile:0xa939838 @tempfile=#<Tempfile:/tmp/RackMultipart20140527-11473-10esj62>, @original_filename="sfnzf.png", @content_type="image/png", @headers="Content- Disposition: form-data; name=\"picture[uploaded_picture]\"; filename=\"sfnzf.png\"\r\nContent-Type: image/png\r\n">}, "commit"=>"Upload file"}    (0.2ms) begin transaction Binary data inserted for `string` type on column `content_type`    (0.1ms) rollback transaction Completed 500 Internal Server Error in 5ms

TypeError (can't cast Enumerator to string):   app/controllers/upload_controller.rb:8:in `save'