You see the error as in the screenshot, is because there are multiple fields in the Time Tracker object with the same name.

While creating any field in Salesforce related to the PK4 TimeTracker application, please make sure that you do not add the same field names which already exist in the Time Tracker app.

We suggest you not create the same field names as it already exists in the TimeTracker app because the API names will be same for both the fields and the app fails to load.

e.g: There is a field as Employee Type in the PK4 TimeTracker application already, and if you create a field as "Employee Type" again in Salesforce for the PK4 TimeTracker application, then you see the error as in the screenshot and the users will not be able to track time Check-In for a Job or Project.