Error on gulp-uglify installation with npm

I am new in nodejs and also gulp. I am going to start with node and gulp for some advancement in my development skills.

All thing are going good when installing the node js and gulp. I am checking both of this with checking there version on command prompt. Here's the command:

node -v // for node version
npm -v // for npm

And installing the gulp with npm using command.

npm install -g gulp // gulp global

npm install --save-dev gulp // gulp in my project

After these steps, i am going to install gulp uglify.

npm install --save-dev gulp-uglify

Here's i am receiving the error. But i am not able to understand this error.

And also the path shown in command prompt for npm-debug.log. Here no file generated.

Thanks in advance.