Background Information
This is a known issue caused by a typographical error in the database.
Resolution
Using SQL Server Enterprise Manager tool, open the MSP_WEB_CONVERIONS table in the Project Server database and locate the following string value in the CONV_STRING field:
To view and respond to the changes, please connect to your Microsoft Project Web Access resource calendar changes at ^4/Transactions/CalendarTrans.asp.\n\n
Change the "CalendarTrans.asp" text to "CalendarTransactions.asp".