surface speed is extremely far off. Start by setting everything no higher than 30mm/s for your x and y and no faster than 4mm/s for you z, any move that could include the z like plunge or ramp no more than 4mm/s. Until you figure out where the mistake is, then start speeding things back up one setting per job.
set your ramp equal to your plunge just in case.
you know you have to set that for each cut you have on that tree right?
I need a screenshot of your prost process screen right before you hit generate. I know the post processor works but all the setting can be changed.
Please keep all the changes minimal, please no other 3d printer forums and stuff. this works you just have a bad setting somewhere.