Hi the inside of the attachment data and R program (random forrest tree algorithm), I ran as a result, the error is big, what does any method, error can be reduced? (merger, reducing column?

Thank you, can help brother

http://corpus.eduhk.hk/code/ThermalComfort_MCI.R

http://corpus.eduhk.hk/code/3view.xlsx

Thank you thank you thank you very much