Unable to initialize UI modifications module


I want to add UI Modifications to my app. Basically I call an API in the jira:issuePanel and want to make a modification to the UI afterwards. However I am getting the following error message in Jira and I don’t know how to solve this issue.

Uncaught (in promise) Error: Unable to initialize UI modifications module: No handler found for post message: getUiModificationsInternalAPI from https://1i55t7k-1xpi1oyacg-18lrvf5wwr--kqi2y6-18ejfdlfyr-qrg6ry1pf.cdn.prod.atlassian-dev.net in https://myrmod.atlassian.net/jira/software/projects/DEV/boards/1
    at getInternalAPI.js:26:19
    at Generator.throw (<anonymous>)
    at l (tslib.es6.mjs:119:62)

Best regards