Error in formatError function

[sujeshthekkepatt]

I am getting Error in formatError function: TypeError: Cannot read property 'output' of undefined. followed the instructions setting up it with Apollo.

[perrygeorget]

I get the same error. Here is our stack trace:

Error in formatError function: TypeError: Cannot read property 'output' of undefined at Object.formatError (/var/app/current/node_modules/graphql-apollo-errors/dist/index.js:81:10) at /var/app/current/node_modules/graphql-server-core/src/runQuery.ts:75:30 at Array.map (native) at format (/var/app/current/node_modules/graphql-server-core/src/runQuery.ts:72:23) at doRunQuery (/var/app/current/node_modules/graphql-server-core/src/runQuery.ts:153:42) at /var/app/current/node_modules/graphql-server-core/src/runQuery.ts:59:39 at bound (domain.js:280:14) at runBound (domain.js:293:12) at tryCatcher (/var/app/current/node_modules/bluebird/js/release/util.js:16:23) at Promise._settlePromiseFromHandler (/var/app/current/node_modules/bluebird/js/release/promise.js:512:31) at Promise._settlePromise (/var/app/current/node_modules/bluebird/js/release/promise.js:569:18) at Promise._settlePromiseCtx (/var/app/current/node_modules/bluebird/js/release/promise.js:606:10) at Async._drainQueue (/var/app/current/node_modules/bluebird/js/release/async.js:138:12) at Async._drainQueues (/var/app/current/node_modules/bluebird/js/release/async.js:143:10) at Immediate.Async.drainQueues (/var/app/current/node_modules/bluebird/js/release/async.js:17:14) at runCallback (timers.js:672:20) at tryOnImmediate (timers.js:645:5) at processImmediate [as _immediateCallback] (timers.js:617:5)

[perrygeorget]

I think the problem is that the nonBoomTransformer function needs to return an ErrorResult instance. It would be nice to have an example of how to implement those methods.