My operating system is window 7, and I have been using nrfjprog v10.12.2 before. When I updated nrfjprog to v10.15.0, the following error occurred when using nrfjprog -v.
I also tried v10.14.0 and v10.13.0, and the problem was the same. Back to v10.12.2 and the entire tool chain is normal.
