Error: Slack request failed with error not_allowed_token_type

[vadirajks]

Hi, i used this before and it used to work perfectly. Somehow it is breaking now with the below error.
(node:18118) UnhandledPromiseRejectionWarning: Error: Slack request failed with error not_allowed_token_type
at EmojiAdminList.getAdminListPages (/home/vadiraj/slack/youappi/emojme/node_modules/emojme/lib/emoji-admin-list.js:60:13)
at processTicksAndRejections (internal/process/task_queues.js:97:5)
at async EmojiAdminList.get (/home/vadiraj/slack/youappi/emojme/node_modules/emojme/lib/emoji-admin-list.js:47:26)
at async /home/vadiraj/slack/youappi/emojme/node_modules/emojme/emojme-download.js:72:23
at async Promise.all (index 0)
at async download (/home/vadiraj/slack/youappi/emojme/node_modules/emojme/emojme-download.js:82:36)
(node:18118) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:18118) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Please let us know what we need to do to fix this. Thanks for helping as usually.