Strange error along with strange version numbers in octave

[RT]

I installed the Octave flatpack from the software center and I'm getting a stange error along
with strange Octave version numbers.  Any idea what's going on? I'm using ubuntu 18.04 64bit.

http://i.imgur.com/AanAsDM.png
Could not copy help collection to temporary
file. Search capabilities may be affected.
Cannot create index tables in file /app/share/octave/5.0.91/doc/octave_interpreter.qhc.


----------------------------------------------------------------------
GNU Octave Version: 5.0.91 (hg id: 8c50b03c2016)
GNU Octave License: GNU General Public License
Operating System: Linux 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 2916:28:13 UTC 2019 x86_64
-------------------------------