So, my config looks like this:

{
  "source": "./src",
  "destination": "./esdoc"
}

And if I try to run it on blank rxmq project I get the following error:

➜  rxmq.js git:(master) ✗ esdoc -c esdoc.json
identifiers.html
index.html
/usr/local/lib/node_modules/esdoc/out/src/Publisher/Builder/ClassDocBuilder.js:77
            throw _iteratorError;
                  ^
TypeError: Cannot read property 'indexOf' of undefined
    at ClassDocBuilder._buildSignatureHTML (/usr/local/lib/node_modules/esdoc/out/src/Publisher/Builder/DocBuilder.js:1041:26)
    at /usr/local/lib/node_modules/esdoc/out/src/Publisher/Builder/DocBuilder.js:451:38
    at IceCap.loop (/usr/local/lib/node_modules/esdoc/node_modules/ice-cap/out/src/IceCap.js:319:15)
    at ClassDocBuilder._buildSummaryDoc (/usr/local/lib/node_modules/esdoc/out/src/Publisher/Builder/DocBuilder.js:448:11)
    at ClassDocBuilder._buildSummaryHTML (/usr/local/lib/node_modules/esdoc/out/src/Publisher/Builder/DocBuilder.js:407:29)
    at ClassDocBuilder._buildClassDoc (/usr/local/lib/node_modules/esdoc/out/src/Publisher/Builder/ClassDocBuilder.js:158:38)
    at ClassDocBuilder.exec (/usr/local/lib/node_modules/esdoc/out/src/Publisher/Builder/ClassDocBuilder.js:62:36)
    at publish (/usr/local/lib/node_modules/esdoc/out/src/Publisher/publish.js:121:59)
    at Function.generate (/usr/local/lib/node_modules/esdoc/out/src/ESDoc.js:189:7)
    at ESDocCLI.exec (/usr/local/lib/node_modules/esdoc/out/src/ESDocCLI.js:88:28)

Any thoughts why that might happen?
Using iojs v2.3.3, npm v.2.12.1