default Boilerplate error message

Hi,

i'm new to this, i would like to ask of this issue i'm facing after running yarn build and yarn start :

Error: Failed to parse private key: Error: Invalid PEM formatted message.
at FirebaseAppError.FirebaseError [as constructor] (/Users/zhenhaowu/code/freelance/TodoList/node_modules/firebase-admin/lib/utils/error.js:39:28)
at FirebaseAppError.PrefixedFirebaseError [as constructor] (/Users/zhenhaowu/code/freelance/TodoList/node_modules/firebase-admin/lib/utils/error.js:85:28)
at new FirebaseAppError (/Users/zhenhaowu/code/freelance/TodoList/node_modules/firebase-admin/lib/utils/error.js:119:28)
at new Certificate (/Users/zhenhaowu/code/freelance/TodoList/node_modules/firebase-admin/lib/auth/credential.js:129:19)
at new CertCredential (/Users/zhenhaowu/code/freelance/TodoList/node_modules/firebase-admin/lib/auth/credential.js:192:64)
at Object.cert (/Users/zhenhaowu/code/freelance/TodoList/node_modules/firebase-admin/lib/firebase-namespace.js:224:58)
at Object../src/app.node.js (/Users/zhenhaowu/code/freelance/TodoList/build/app.js:792:37)
at __webpack_require__ (/Users/zhenhaowu/code/freelance/TodoList/build/app.js:645:30)
at /Users/zhenhaowu/code/freelance/TodoList/build/app.js:713:55
at Object. (/Users/zhenhaowu/code/freelance/TodoList/build/app.js:716:10)
at Module._compile (internal/modules/cjs/loader.js:654:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:665:10)
at Module.load (internal/modules/cjs/loader.js:566:32)
at tryModuleLoad (internal/modules/cjs/loader.js:506:12)
at Function.Module._load (internal/modules/cjs/loader.js:498:3)
at Module.require (internal/modules/cjs/loader.js:598:17)

Read src/app.node.js and the firebase-admin Certificate stack shown in the report; reproduce the problem with yarn build and yarn start. Trace which boilerplate configuration supplies the private key and clarify the expected default behavior. Done should be a confirmed diagnosis and an agreed fix or documentation for the reported startup error.

Written by the indexing model from the issue text.