UMP Logon stays in "Loading" phase

Document ID : KB000093157
Last Modified Date : 04/06/2018
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UMP logon displays "loading" message forever and never displays the USM Inventory

The portal.log captures the following error on the primary ump robot:

Error in portal log: -- ERROR [ImageImpl:67] Error reading image 24001 com.liferay.portlet.documentlibrary.NoSuchFileException: C:\Program Files (x86)\Nimsoft\probes\service\data\document_library\0\0\24001.gif\1.0 Caused by: C:\Program Files (x86)\Nimsoft\probes\service\data\document_library\0\0\24001.gif\1.0 (The system cannot find the path specified)
UIM 8.51 dual UMP
EMS 10.17 NAS 8.56
EMS 10.17 requires NAS 9.0

EMS Release Notes link:
Deployed NAS 9.0+