ADS 2016 Envelope Simulator Problem

Hello everyone,

Currently, I am designing an LFM FMCW Radar for my graduation design project in ADS 2016. I am having envelope parameter problems. The Voltage Controlled Oscillator is driven by a Sawtooth pulse having a 10 ms rise time and 2 ms fall time, with the oscillator starting at f = 1 GHz at t = 0 and f = 2 GHz at t = 10ms. I want to simulate for 2 periods, that would be 24 ms, but I constantly get errors like either the timestep is too small or the simulator controller freezes. It has something to do with the order of the envelope controller, I couldn't get it to work properly. Does anybody know how envelope simulator order works? Heres a picture of my project. I would greatly appreciate a response. Thanks in advance.

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