Coverage Invalid report format [html]

[rmartin94]

Hi! I've been using karma and istanbul for quite a while. Been running some unit tests for my angular app, and now while trying to get the coverage for my test I run

ng test --code-coverage

and I'm getting the following error

29 05 2018 10:32:56.941:ERROR [karma]: { Error: Invalid report format [html] at Object.module.exports.create (D:\SDPWebDevGit\node_modules\istanbul-api\lib\input-error.js:6:15) at Reporter.add (D:\SDPWebDevGit\node_modules\istanbul-api\lib\reporter.js:51:30) at D:\SDPWebDevGit\node_modules\istanbul-api\lib\reporter.js:62:18 at Array.forEach (<anonymous>) at Reporter.addAll (D:\SDPWebDevGit\node_modules\istanbul-api\lib\reporter.js:61:14) at createReport (D:\SDPWebDevGit\node_modules\karma-coverage-istanbul-reporter\src\reporter.js:83:14) at browsers.forEach.browser (D:\SDPWebDevGit\node_modules\karma-coverage-istanbul-reporter\src\reporter.js:196:9) at Array.forEach (<anonymous>) at Collection.forEach (D:\SDPWebDevGit\node_modules\karma\lib\browser_collection.js:93:21) at CoverageIstanbulReporter.onRunComplete (D:\SDPWebDevGit\node_modules\karma-coverage-istanbul-reporter\src\reporter.js:195:16) at Server.<anonymous> (D:\SDPWebDevGit\node_modules\karma\lib\events.js:13:22) at emitTwo (events.js:131:20) at Server.emit (events.js:214:7) at Timeout._onTimeout (D:\SDPWebDevGit\node_modules\karma\lib\executor.js:51:17) at ontimeout (timers.js:475:11) at tryOnTimeout (timers.js:310:5) at Timer.listOnTimeout (timers.js:270:5) inputError: true }

This seems quite strange to me, it was working fine before, I haven't updated any node package. Tried cleanning cache, deleting the coverage folder with my previous results but no luck. Then I removed my karma and istanbul nodemodules and installed them again but this error persists. Been looking arround for a solution or if its a common problem but I didn't found anything.

Does someone stumbled with this? Thanks for any info or help!

[oleg-koval]

I have the same, already spent some hours debugging, but no luck

[kievsash]

Had this issue, but somehow removing node_modules and making npm install again solved this.