Rescan / Initializing infinite loop

[Charles7]

I opened my Minimserver Status webpage on my smartphone, although Minimserver itself is installed on my PC. The program announced an update, which I selected and which apparently was installed. Now, on the PC or on the smartphone, when I choose Rescan on the Media server status page for Minimserver, it goes into a rapid infinite Rescan / Initializing loop for five or ten minutes, then stops with the message: Unexpected exception java.lang.NullPointerException.

How do I recover?

[Charles7]

After looking at the Minimstreamer | Properties webpage, then back to the Minimserver Status webpage, it displays:

Profile error setting property stream.converter: Exception while setting property stream.converter to : java.lang.NullPointerException

and nothing happens when I click on Rescan

(I have long had a license and had ffmeg.exe in C:\Users\<nam>\AppData\Roaming\MinimServer\opt\bin )

Also, the Minimserver | License webpage now says

You are using MinimServer Starter Edition.

But when I go to Minimiserver | License | Activate webpage and enter my license code and email address, the similar error message appears:

Profile error setting property stream.converter:
Exception while setting property stream.converter to opt/bin/ffmpeg: java.lang.NullPointerException

[Charles7]

After restarting my PC and hence Minimserver, the Status now displays Full license. Click on Rescan does nothing except display the error message.