Mocha AE keeps crashing while motion tracking

Hello, i bought a new Imac for video editing in premiere pro 2017, after effects 2017 and mocha ae. Even though my mac surpasses the recommended specs, Mocha keeps crashing when motion-tracking and when playing the video. Im working on 2700p video at 60fps.
These are the specs of my computer: Retina 4K Display
3.4GHz Processor
1TB Storage
3.4GHz quad-core 7th-generation Intel Core i5 processor
Turbo Boost up to 3.8GHz
8GB 2400MHz memory, configurable up to 32GB
1TB Fusion Drive1
Radeon Pro 560 with 4GB video memory
Two Thunderbolt 3 ports
Retina 4K 4096-by-2304 P3 display