What has happened is the drain tube for the defrosted moisture, that is collected during the defrost cycle of your unit, has become plugged. When this happens the water builds up in the catch funnel till it over flows and then spills into the freezer compartment.
Toi fix this you need to locate the drain tube in the back of the unit.
Pull the unit away from the wall and unplug it (the power cord). Pull it out further till you have clear acces to the back of the unit. Useing a good bright flashlight. Look at the lower back and locate the compressor. Ir is a oval shaped thing that looks like a mini turkey roasting oven. Well sort of anyways. These are always painted black and some have the specification tags on them. Look ablve this and see if there is a pan or tray or anything that would hold water. Above that is the drain tube coming from the inside. you need to poke a wire up into that tube and unplug it. Be ready with some towels as there may be quite a bit of water that comes out when you unplug it.
Thats about it.
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Hey. I'll have to remember that trick!! Never thought of that.
Well it is a good day today. But then any day you learn something new is a good day.
Thank you for the accept, and the new trick as well.