Istanbul file permission problem: coverage/lcov-report cannot be created

[ORESoftware]

i see this:

/Users/alexamil/.nvm/versions/node/v6.10.2/lib/node_modules/istanbul/node_modules/mkdirp/index.js:90
                    throw err0;
                    ^

Error: EACCES: permission denied, mkdir '/Users/alexamil/WebstormProjects/oresoftware/poolio/coverage/lcov-report'
    at Error (native)
    at Object.fs.mkdirSync (fs.js:923:18)
    at Function.sync (/Users/alexamil/.nvm/versions/node/v6.10.2/lib/node_modules/istanbul/node_modules/mkdirp/index.js:71:13)
    at FileWriter.copyFile (/Users/alexamil/.nvm/versions/node/v6.10.2/lib/node_modules/istanbul/lib/util/file-writer.js:143:16)
    at /Users/alexamil/.nvm/versions/node/v6.10.2/lib/node_modules/istanbul/lib/report/html.js:552:32
    at Array.forEach (native)
    at copyAssets (/Users/alexamil/.nvm/versions/node/v6.10.2/lib/node_modules/istanbul/lib/report/html.js:543:40)
    at /Users/alexamil/.nvm/versions/node/v6.10.2/lib/node_modules/istanbul/lib/report/html.js:562:13
    at Array.forEach (native)
    at HtmlReport.writeReport (/Users/alexamil/.nvm/versions/node/v6.10.2/lib/node_modules/istanbul/lib/report/html.js:561:26)
 [suman] Error: Test coverage process exitted with non-zero exit code => "1". 

it looks like Istanbul creates the coverage directory but it doesn't have the right permissions, so then it fails to be able to write the lcov-report directory out.

[ORESoftware]

Even if I create the coverage directory myself and then do

mkdir coverage
chmod -R 777 coverage

and then run Istanbul, Istanbul will experience the above error, and then the coverage directory will have the wrong permissions again. Damn.

[ORESoftware]

should I just use the nyc executable instead?