Unable to generate .cfg file for pinmux configuration

I am using Ubuntu 18.04.3 on my Host machine and installed latest SDK manager for TX2 development.
I have generated all the .dtsi file as per my custom carrier board using this link https://docs.nvidia.com/jetson/archives/l4t-archived/l4t-281/index.html#page/Tegra%2520Linux%2520Driver%2520Package%2520Development%2520Guide%2Fl4t_pinmux.html%23wwpID0E0HB0HA but unable generate .cfg file. Please find below the message I get

jetson@jetson-S15AB:~/Workspace/Pinmux$ sudo python pinmux-dts2cfg.py --pinmux addr_info.txt gpio_addr_info.txt por_val.txt mandatory_pinmux.txt tegra18x-jetson-tx2-config-template-pinmux.dtsi tegra18x-jetson-tx2-config-template-gpio-default.dtsi
##
## Pinmux version tegra18x-jetson-tx2-config-template-gpio-default.dtsi
## Input pinmux file name: mandatory_pinmux.txt
## Input gpio file name: tegra18x-jetson-tx2-config-template-pinmux.dtsi
## Generation date: 2019-09-20 11:54
## PLEASE DO NOT EDIT THIS FILE
## This is autogenerated file using the script pinmux-dts2cfg.py
##
pinmux.major = 1;
pinmux.minor = 0;

Please read the README which is under the same directory as your pinmux-dts2cfg.py.