I am a novice user, Mark H. Webb.  I am programmer and learning C++. 
I was compiling a program from github.  The item to compile was cilantro a point cloud library in C++. the lib has many dependencies and I thought i got them all, but I missed one, tinyply.
When I went to complied tinyply i get the following on terminal shell:
Could not find the database of available applications, run update-command-not-found as root to fix this
Sorry, command-not-found has crashed! Please file a bug report at:
http://www.debian.org/Bugs/Reporting
Please include the following information with the report:
command-not-found version: 0.3
Python version: 3.7.3 final 0
Distributor ID:	Debian
Description:	Debian GNU/Linux 10 (buster)
Release:	10
Codename:	buster
Exception information:
local variable 'cnf' referenced before assignment
Traceback (most recent call last):
  File "/usr/share/command-not-found/CommandNotFound/util.py", line 23, in crash_guard
    callback()
  File "/usr/lib/command-not-found", line 93, in main
    if not cnf.advise(args[0], options.ignore_installed) and not options.no_failure_msg:
UnboundLocalError: local variable 'cnf' referenced before assignment 
I am unsure how to clear this?  Is it as simple as deleting a file?  or do i need to edit a file?
Sorry if this is in the addressed issues already.
Thank you
Mark Webb