TF234031: One or more work items that were imported to the project plan are missing data because a list separator value appears ...

TF234031: One or more work items that were imported to the project plan are missing data because a list separator value appears in the value(s) of the following field(s):
    
{0}
To ensure that all data for the work item is included in the project plan, contact the administrator to remove any list separator value ({1}) from the values of the reference field in the team project. Then, refresh your project plan to include the missing values.