Freeze Ubuntu when running CasparCG Server

I am using Ubuntu 16.04.5 on the following PC configuration:
CPU: Intel Core i7 7820X @ 3.60 x16
GPU: NVIDIA GT 730 (Nouveau display driver - open source)
Storage: 1 TB HDD + 320 GB SSD

I run the CasparCG Server version 2.1.0 Beta 2 on this PC and the Client on a Windows-based PC and connect them via LAN.

At first on ubuntu PC, the Server is encountered by problem after i executed “” that i solve it by installing the related package. Again execute “” in a terminal window. After few seconds Ubuntu becomes freezing and no response to mouse and keyboard interrupts.
According to log file generated by the Server, it seems this problem related to OpenGL or Graphic card driver.
Log file is here:
caspar_2018-12-09.log.htm (14.6 KB)

What is the problem?