Runtime error with extensions

Good morning
I use LibreOffice (5.2.2.2) on Windows (7 / 10) and Linux machines.
Rarely I try to use extensions. Recently in particular:
* Alternative Searching
* Anaphraseus
(have not really tried any other extensions)

However, EVERY time I am trying to start those extensions on the Windows machines (NOT the linux machine: Linux Mint 17.3 / LibreOffice 4.4.3.2), I get the following error:
Basic runtime error.
An exception occurred
Type:
com.sun.star.container.NoSuchElementException
Message: .
OK

When I go into "Extensions" and disable the respective extension once and then (immediately after) enable it again,
they work.
But the next time I start LibreOffice it is again the same thing.

Is there a way to fix this?
Googling did not bring up any solutions so far.

Thank you
Thomas

May I ask the same thing again?
There seem to have been no replies.
Sorry for the inconvenience.

Hi Thomas,

that is an error inside the extension. You should contact the author of that extension.

Do you have the correct version of the extension? For 'Alternative Searching' I see the comment "Fixed error after starting on LO 5.3.1.2". That might be the same problem as you get for LO 5.2.2.2.

In general, make sure the extension claims to be compatible with your LibreOffice version.

Kind regards
Regina