CAPE CANAVERAL, Fla. — A case of mice and mold.

SpaceX scrubbed Tuesday morning's Falcon 9 rocket launch when mold was found on food bars meant for mice, according to NASA.

The SpaceX Falcon 9 rocket is now set to launch at 1:16 p.m., Wednesday, December 5, from the Cape Canaveral Air Force Station for a commercial resupply mission to the International Space Station.

Among the Christmas provisions, supplies and science experiments heading to the ISS are 40 mice, which are part of a project to study the effects of microgravity on aging.

"The launch was moved to Wednesday after mold was found on food bars for a rodent investigation prior to handover to SpaceX. Teams will use the extra day to replace the food bars," NASA stated.

Weather is expected to be excellent for Wednesday's launch attempt. 

SpaceX will also try to land the rocket's first stage booster at landing zone one at Cape Canaveral Air Force Station, so expect to hear a sonic boom if you are in the area.