I removed the missing driver from the list and presto! All was well again. Then I noticed that the VirtualDriver registry value contained a list of drivers that corresponded with the sub keys of the Modules key (parent of the ICA 3.0 key). However, even though my VirtualDriverEx registry value was indeed empty my error couldn’t be fixed by correcting it’s data. It pointed my attention to registry key HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\ICA Client\Engine\Configuration\Advanced\Modules\ICA 3.0. I did find Citrix Knowledge base article CTX238932 where this error was featured. I never heard of this driver and neither did google (it’s probably RES ONE WorkSpace Licensing). In our case the driver was called RESWSL. I’ve blurred the driver name in parentheses because it can be different in your case. I recently upgraded Citrix Receiver 4.7 to Citrix Workspace App 1904 and came across this issue: when logging in the following error occurred:
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