Issues with xgboost

[EvanGertis]

I am trying to follow the README to get started with this project. So far I ran

make

in the xgboost directory. I successfully created the project. Then I downloaded the conf files by running

./download_data.sh

Then I went up a directory and I gave permissions to xgboost like so

chmod +x ./xgboost

I followed the example

./xgboost data/ori_mnist.conf

However, I get back

zsh: permission denied: ./xgboost

I manually installed xgboost with pip. It works for some cases, but not for the one shown below:

xgboost data/ori_mnist.conf       
Error running xgboost:

Invalid Input: 'robust_exact', valid values are: {'approx', 'auto', 'exact', 'gpu_hist', 'hist'}
Use xgboost -h for showing help information.