Summary:
The article is reference errors with adding Periods in 4.x and referencing 4.x Portal.
Method:
If you add a new Fiscal year to 4.x Data Warehouse Manager and receive PeriodCalc Error as below when you run reports in the 4.x Web Portal.
Restart the Webserver that the 4.x Web Portal and Log into the Portal.
Properties:
4.x Portal, Adding Periods, PeriodCalc