So I purchased a 2day pass. and printed the ticket. I've already went once and signed the ticket(paper) with the barcode. But now ive lost that paper. Can I just print a new one and use it for my 2nd visit .

I don't know if the Accesso store will let you reprint the ticket, if you didn't save the PDF from the first time around. Since you've visited once, it's considered used.

Assuming you do get it reprinted, my suggestion is to visit Guest Services if you have problems getting in. The policy is that it must be signed both times at the gate, with the second signature matching the first. This prevents ticket fraud. As to whether they'd let you in anyway, only the park can give you an answer.

If you can't get it reprinted, you could visit Guest Services with your e-mail confirmation, photo ID, and the credit card you paid with. Again, absolutely no guarantees.

You may want to call the park beforehand, if the ticket's validity will affect whether or not you visit.