Error: invalid option "--grm-singleton"

Hello, I would like to create a file containing those individuals from my data-set who have been excluded due to relatedness. For this I wanted to use  --grm-singleton 0.025:

./gcta64 --grm-gz my_data --grm-singleton 0.025 --out my_data_extract

However, I received the following error:

Could you please advice me what may be causing this error and how I could address it? Thank you very much in advance.