While trying to launch virtual desktop, getting error “Could not load error message”. Launching application has no issue. If we disable protocol handler from Storefront, the issue can be fixed.

To resolve the issue, remove the following line from default.ica ("C:\inetpub\wwwroot\Citrix\<StoreName>\App_Data\default.ica" ) from Storefront server, everything works as expected:

ClientHostedApps=1
RTWIMode=1

Problem Cause

Comparing the trace we find that some parts are missing in ica file, after checking, the user found that their customized setting of ica file caused the issue.