email/instagram sync error with pubsub

[AbhiAgarwal]

Sep 14 15:57:01 api-change-utilities-1-ip-10-0-0-184 email: error Error: Error: Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project. 
Sep 14 15:57:01 api-change-utilities-1-ip-10-0-0-184 email: error         at /var/apps/api-change-util/email.js:45:29 
Sep 14 15:57:01 api-change-utilities-1-ip-10-0-0-184 email: error         at /var/apps/api-change-util/email.js:36:16 
Sep 14 15:57:01 api-change-utilities-1-ip-10-0-0-184 email: error         at /var/apps/api-change-util/node_modules/@google-cloud/pubsub/src/index.js:121:7 
Sep 14 15:57:01 api-change-utilities-1-ip-10-0-0-184 email: error         at /var/apps/api-change-util/node_modules/@google-cloud/pubsub/node_modules/@google-cloud/common/src/grpc-service.js:288:5 
Sep 14 15:57:01 api-change-utilities-1-ip-10-0-0-184 email: error         at onResponse (/var/apps/api-change-util/node_modules/retry-request/index.js:120:7) 
Sep 14 15:57:01 api-change-utilities-1-ip-10-0-0-184 email: error         at Object.callback (/var/apps/api-change-util/node_modules/@google-cloud/pubsub/node_modules/@google-cloud/common/src/grpc-service.js:269:13) 
Sep 14 15:57:01 api-change-utilities-1-ip-10-0-0-184 email: error         at /var/apps/api-change-util/node_modules/@google-cloud/pubsub/node_modules/grpc/src/node/src/client.js:572:12 

not sure why this is an issue