Open the Active Administrator database in SQL Management Studio, open the tables, and select the top 1000 rows from dbo.tblSchedule.
Here check to see if any of the schedules have a blank entry in the TimeZone column. If so, edit the table and copy the timezone entry from another schedule which has its TimeZone set. If you see all values NULL then check the time for local server using below PowerShell commands.
To get the list of valid values for that field, you can run the following PowerShell:
[System.TimeZoneInfo]::GetSystemTimeZones() |% { $_.Id } | Sort-Object
To get the value for the time zone of the local machine, you can run this PowerShell:
[System.TimeZoneInfo]::Local.Id
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