I have had this exact issue! We had two failed prints using clear resin, and there had been extra bits that remained in the resin tray after that we failed to see. We used the tank tool provided with the printer to get the large chucks out and to loose any harden resin on the bottom. Unfortunately, we still had small bits that I imagine were parts of the support structure. We used a paint strainer to get out any remaining bits, pouring out the resin tank through the strainer into a photo sensitive container and then putting it back into the resin tray. After this we haven’t had another failed print, or wiper error!
Good Luck!