grunt karma getting error .... Loading "grunt-karma.js" tasks...ERROR

Question

Loading "grunt-karma.js" tasks...ERROR

TypeError: Cannot read property 'prototype' of undefined Warning: Task "karma" not found. Use --force to continue.

Aborted due to warnings.

I'm experiencing this issue too. I'm using node 7.5.0 and npm 4.1.2.

Solution 1

I faced a similar problem. The following correction helped me

"grunt-karma": "^0.12.2",
"karma": "^1.6.0",

Read more here

Solution 2

Doing npm install on karma helped me fix this problem.