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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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'


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: 


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


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.