Engine light!

I bought a used jk unlimited a couple of months ago.
While going thru my Jeep I opened the air cleaner box to replace the filter element.i didn't notice right away but I knocked the hose loose that runs to my valve cover.The hose rubbed on the fan belt and wore a spot thin,I just plugged it back in and forgot it till today.
Well on my way home from work my engine light came on,everything looked fine so I drove up to the auto parts store to have my code read.
Tech said it was a " evaporative system air leak" and then I remembered the time my hose rubbed the fan belt and pulled it off,wrapped some electrical tape around it,reset my code and wouldn't you know it,that's all my problem was.....