Build 191 installed but not starting.

Document ID : KB000126306
Last Modified Date : 08/02/2019
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I have installed Web Viewer Build 191 into a new WAS v8.5.5.134 cell but the application is not stating and throws errors related to ClassNotFoundException. Can you confirm 191 works for WAS v8.5 please?
I just performed a new install from a maintenance Build of 12.1 Web Viewer and the application will not start. Why?
If by "installed Web Viewer Build 191 into a new WAS v8.5.5.134 cell" you mean that you downloaded and installed Solution 84 CUMULATIVE BUILD 191 FOR WEB VIEWER 12.1: PTF SO05739 to your new WAS cell, that will be a problem. Build 191, like all maintenance builds, are not to installed. Rather, they should be applied against an existing install, or more accurately, you update an existing install with a maintenance Build. 

. . The prescribed procedure for getting 12.1 Web Viewer at Build 191 to a new WAS cell would be to first install the 12.1 Web Viewer base product - download CA Output Management Web Viewer Plus MULTI-PLATFORM 12.1 S1409 from and install it. You would then download and update to CUMULATIVE BUILD 191 FOR WEB VIEWER 12.1Fix #SO05739.
Additional Information:
Maintenance Builds of 12.1 Web Viewer while cumulative, do dot include the full application. If "installed" by themselves (instead of on top of the base product), the application will not start/run.