This clearly tells you that your model contains far too many edges for a .kmz file… almost 3 million!
Accessing the links that I already gave you twice, I read through the respective threads and found some possible solutions. Have you tried to search, read and apply it on your model?
//edit
A solution for a similar case, where the number of edges was too high, was to divide the model into smaller parts and export each one separately as kmz files.