During installation of Office Web Apps recently, I noticed something strange. After installing Office Web Apps on all the servers in the farm, I proceeded towards running the SharePoint Configuration wizard on one server and I was presented with the error below.
For some reason, SharePoint is thinking that Office Web Apps is missing on one server and wants me to install Office Web Apps on that particular server. This is not true as I ensured that I installed Office Web Apps on all the servers in the farm. Clicking refresh did not help!
I have seen similar error while installing SP1, in fact it was known issue while installing SP1 and the fix was running a PowerShell cmdlet which refreshes the list of installed SharePoint products. Here is what I did
Opened up SharePoint PowerShell Management Console and ran the following command
After running this command and clicking refresh, the SharePoint Config Wizard went through successfully.