while installing karma in windows cmd using 'npm install karma --save-dev' there is an error:

C:\Users\acer pc\Desktop\mean\testingMean>npm install karma --save-dev npm ERR! Unexpected end of input at 1:76752 npm ERR! 0a5126b","tarball":"http://ift.tt/2vTYyot. npm ERR! ^

npm ERR! A complete log of this run can be found in: npm ERR! C:\Users\acer pc\AppData\Roaming\npm-cache_logs\2017-08-20T07_47_15_460Z-debug.log

C:\Users\acer pc\Desktop\mean\testingMean>npm install karma --save-dev npm ERR! Unexpected end of input at 1:76752 npm ERR! 0a5126b","tarball":"http://ift.tt/2vTYyot. npm ERR! ^

npm ERR! A complete log of this run can be found in: npm ERR! C:\Users\acer pc\AppData\Roaming\npm-cache_logs\2017-08-20T07_47_32_242Z-debug.log