MII fails to load Workbench or Menu from client pc.

when trying to open the MII workbench or Administration menu we receive the following errors.

404 Not Found.

The requested resource /XMII/Workbench.jsp is not available.

Details: File [Workbench.jsp] not found in application root of alias [XMII] of J2EE application [sap.com/xapps_xmiiear].

404 Not Found.

The requested resource /XMII/Menu.jsp is not available.

Details: File [Menu.jsp] not found in application root of alias [XMII] of J2EE application [sap.com/xapps_xmiiear].

we are running MII version 12.0.11 Build(14) on a windows server platform.

we have had this problem several times in the last couple of years on MII servers that were operational.

to resolve the issue our support team is copying the missing files from another MII environment to the failing server.

Is this the correct process to resolve the problem?

any idea why these files would go missing in the first place?

Thank you for any response to my question.

Bob