{"error":"The first argument must be one of type string or Buffer. Received type undefined","stack":"TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be one of type string or Buffer. Received type undefined\n    at write_ (_http_outgoing.js:607:11)\n    at ServerResponse.write (_http_outgoing.js:579:10)\n    at app.use (/data/web/runner/serve.js:126:17)\n    at dispatch (/data/web/node_modules/koa-compose/index.js:42:32)\n    at /data/web/node_modules/vray/serve/mountStatic.js:97:15\n    at dispatch (/data/web/node_modules/koa-compose/index.js:42:32)\n    at serve (/data/web/node_modules/vray/node_modules/koa-static/index.js:59:11)\n    at dispatch (/data/web/node_modules/koa-compose/index.js:42:32)\n    at app.use (/data/web/node_modules/vray/middleware/qs.js:5:15)\n    at dispatch (/data/web/node_modules/koa-compose/index.js:42:32)\n    at /data/web/node_modules/koa-body/index.js:148:14\n    at processTicksAndRejections (internal/process/next_tick.js:81:5)"}