UMP fails to open with error An unexpected system error occurred. Resource exception on init.vm

Document ID : KB000044304
Last Modified Date : 14/02/2018
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Problem: 

USM URL produces error An unexpected system error occurred. 

wasp.log may show this:
javax.servlet.jsp.JspException: org.apache.velocity.exception.ResourceNotFoundException: Unable to find resource '_SERVLET_CONTEXT_/html/themes/_unstyled/templates/init.vm'

Environment:  

UIM 8.4 and UIM 8.4 SP1 and possibly after upgrading to UIM 8.4 SP1 and deploying the UMP Server Meta-Package on the UMP server system: 

Cause: 

probes\service\wasp\webapps\ROOT  becomes corrupted or files missing

Resolution/Workaround:

1. Deactivate wasp 
2. Backup the probes\service\wasp\webapps\ROOT 
3. Delete the probes\service\wasp\webapps\ROOT 
4. Activate wasp, waiting to get port and pid 
5. Clear browser cache and test.